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Morphology
Morphology is a subdiscipline of linguistics that studies
word structure. Words are at the interface between phonology, syntax and semantics (Spencer / Zwicky).
There are many current approaches to morphology. For expository purposes, this article will describe the phenomena in a fairly traditional way: treating words as combinations of discrete meaningful units (morphemes) put together by concatenation. A contemporary morphologist would call this a "morpheme-based" theory; alternatives are lexeme-based morphology and word-based morphology .

The components of a word form are called morphemes. Word formation rules describe how to select morphemes from the lexicon and to combine them.
Important concepts:
• Inflection
• Derivation
• Compounding ( examples)
At the basic level, words are made of " morphemes." These are the smallest units of grammar: roots, prefixes, and suffixes. Native speakers recognize the morphemes as grammatically significant or meaningful. For example, "schoolyard" is made of "school" + "yard", "makes" is made of "make" + a grammatical suffix "-s", and "unhappiness" is made of "happy" with a prefix "un-" and a suffix "-ness".
Inflection occurs when a word has different forms but essentially the same meaning, and there is only a grammatical difference between them: for example, "make" and "makes". The "-s" is an inflectional morpheme.
In contrast, derivation makes a word with a clearly different meaning: such as "unhappy" or "happiness", both from "happy". The "un-" and "-ness" are derivational morphemes. Normally a dictionary would list derived words, but there is no need to list "makes" in a dictionary as well as "make".
These examples also illustrate the other two kinds of morphemes, unbound (which are meaningful on their own) and bound (which have meaning when combined with another morpheme). Thus, the word "schoolyard" consists of two unbound morphemes ("school" and "yard"), while the word "makes" has one unbound ("make") and one bound, and "unhappiness" has one unbound and two bound.
A word may consist of two bound morphemes: the word "morpheme" itself illustrates this, since it consists, or traditionally consisted, of two bound morphemes ("morph" and "eme"). But as the example of "morpheme" reveals, bound morphemes may become unbound ones: "morph" has been adopted in linguistics for the phonological realization of a morpheme, and the verb "morph" was coined to describe a transition between morphological states (usually biological). A more familiar example is if we adopt the suffix "-ish" as a separate word, and use "ish" by itself to mean "somewhat, a bit, so-so". The suffix "-ism" is often applied in a similar way to mean "a system of beliefs or an ideology" (e.g. Darwinism).
A morpheme may have different realizations (morphs) in different contexts. For example, the verb morpheme "do" of English has three quite distinct pronunciations in thewords "do", "does" (with suffix "-s"), and "don't" (with "-n't"). Such alternating morphs of a morpheme are called its allomorphs. Other examples are in past tenses of verbs: "I have walked", "I have eaten", "I have drunk": one verb has a regular "-ed" allomorph, one has a less common "-en" allomorph, and one changes the vowel inside the verb. This last case is a problem for description, because you can't separate the morpheme "drink" from the morpheme for past tense. The two appear fused.
In some languages, of which Latin forms a prime example, several inflections are often fused into one phonetic form. These are called fusional languages. For example, dominus "master" has plural domini, while domina "mistress" has plural dominae. The ending -us contains the ideas of masculine and singular, and in addition is only used in the nominative case. In the accusativeThe term accusative may be used in the following contexts: A form of morphosyntactic alignment, as found in nominative-accusative languages. The accusative case, which is a grammatical case found in nominative-accusative languages that employ explicit mor singular it is dominum, and in the genitive plural it is dominorum. It is impossible to isolate separate morphemes for case, or gender, or number. In contrast to fusional languages, agglutinative languageAn agglutinative language is a language in which the words are formed by joining morphemes together. This term was introduced by Wilhelm von Humboldt in 1836 to classify languages from a morphological point of view. It was derived from the Latin verb aggls such as Turkish use multiple morphemes in the one word but they are all phonetically separable.
The Semitic languages show an extreme of fusion, in that word roots are often represented by fixed consonants, usually three, and their inflection and derivation is done with internal vowel patterns as well as affixes. For example, in Arabic we find kataba "he wrote", yaktubu "he writes", kaatib "writer", kitaab "book", maktab "office". All these form use the consonant cluster KTB.
Suppletion is the replacement of a regular form by an unrelated word. In English "go" has the past tense "went", and "be" has various unrelated parts such as "am" and "was".
A cranberry morpheme is one that exists only in one bound form, such as the "cran-" of "cranberry". It is unrelated to the word "cran" meaning a case of herrings, and though it actually comes from "crane" the bird, it is not at all clear why. Phonetically, the first morphemes of "gooseberry" and "raspberry" also count as cranberry morphemes, as they don't occur by themselves, but the spelling gives an obscure clue to their origin. Compare these to "blackberry", which has two obvious unbound morphemes.


Phonology
Phonology is the systematic use of sound to encode meaning in any spoken human language, or the field of linguistics studying this use. Just as a language has syntax and vocabulary, it also has phonology in the sense of a sound system. When describing the formal area of study, the term typically describes linguistic analysis either beneath the word (e.g., syllable, onset and rhyme, phoneme, articulatory gestures, articulatory feature, mora, etc.) or to units at all levels of language that are thought to structure sound for conveying linguistic meaning.
It is viewed as the subfield of linguistics that deals with the sound systems of languages. Whereas phonetics is about the physical production, acoustic transmission and perception of the sounds of speech, phonology describes the way sounds function within a given language or across languages to encode meaning. The term "phonology" was used in the linguistics of a greater part of the 20th century as a cover term uniting phonemics and phonetics. Current phonology can interface with disciplines such as psycholinguistics and speech perception, resulting in specific areas like articulatory or laboratory phonology.
An important part of traditional forms of phonology has been studying which sounds can be grouped into distinctive units within a language; these units are known as phonemes. For example, in English, the [p] sound in pot is aspirated (pronounced [pʰ]), while the word- and syllable-final [p] in soup is not aspirated (indeed, it might be realized as a glottal stop). However, English speakers intuitively treat both sounds as variations (allophones) of the same phonological category, that is, of the phoneme /p/. Traditionally, it would be argued that if a word-initial aspirated [p] were interchanged with the word-final unaspirated [p] in soup, they would still be perceived by native speakers of English as "the same" /p/. (However, speech perception findings now put this theory in doubt.) Although some sort of "sameness" of these two sounds holds in English, it is not universal and may be absent in other languages. For example, in Thai, Hindi, and Quechua, aspiration and non-aspiration differentiates phonemes: that is, there are word pairs that differ only in this feature (there are minimal pairs differing only in aspiration).
In addition to the minimal units that can serve the purpose of differentiating meaning (the phonemes), phonology studies how sounds alternate, i.e. replace one another in different forms of the same morpheme (allomorphs), as well as, e.g., syllable structure, stress, accent, and intonation.
The principles of phonological theory have also been applied to the analysis of sign languages, even though the sub-lexical units are not instantiated as speech sounds. The principles of phonological analysis can be applied independently of modality because they are designed to serve as general analytical tools, not language-specific ones. On the other hand, it must be noted, it is difficult to analyze phonologically a language one does not speak, and most phonological analysis takes place with recourse to phonetic information.
Semantic
Semantic is the study of meaning. It typically focuses on the relation between signifiers, such as words, phrases, signs and symbols, and what they stand for.
Linguistic semantics is the study of meanings that humans use language to express. Other forms of semantics include the semantics of programming languages, formal logics, and semiotics.
The word "semantics" itself denotes a range of ideas, from the popular to the highly technical. It is often used in ordinary language to denote a problem of understanding that comes down to word selection or connotation. This problem of understanding has been the subject of many formal inquiries, over a long period of time, most notably in the field of formal semantics. In linguistics, it is the study of interpretation of signs or symbols as used by agents or communities within particular circumstances and contexts.[3] Within this view, sounds, facial expressions, body language, proxemics have semantic (meaningful) content, and each has several branches of study. In written language, such things as paragraph structure and punctuation have semantic content; in other forms of language, there is other semantic content.[3]
The formal study of semantics intersects with many other fields of inquiry, including lexicology, syntax, pragmatics, etymology and others, although semantics is a well-defined field in its own right, often with synthetic properties.[4] In philosophy of language, semantics and reference are related fields. Further related fields include philology, communication, and semiotics. The formal study of semantics is therefore complex.
Semantics contrasts with syntax, the study of the combinatorics of units of a language (without reference to their meaning), and pragmatics, the study of the relationships between the symbols of a language, their meaning, and the users of the language.
In linguistics, semantics is the subfield that is devoted to the study of meaning, as inherent at the levels of words, phrases, sentences, and larger units of discourse (referred to as texts). The basic area of study is the meaning of signs, and the study of relations between different linguistic units: homonymy, synonymy, antonymy, polysemy, paronyms, hypernymy, hyponymy, meronymy, metonymy, holonymy, linguistic compounds. A key concern is how meaning attaches to larger chunks of text, possibly as a result of the composition from smaller units of meaning. Traditionally, semantics has included the study of sense and denotative reference, truth conditions, argument structure, thematic roles, discourse analysis, and the linkage of all of these to syntax.
Syntax
Syntax is the study of the principles and rules for constructing sentences in natural languages.
In addition to referring to the discipline, the term syntax is also used to refer directly to the rules and principles that govern the sentence structure of any individual language, as in "the syntax of Modern Irish.
Modern research in syntax attempts to describe languages in terms of such rules. Many professionals in this discipline attempt to find general rules that apply to all natural languages. The term syntax is also sometimes used to refer to the rules governing the behavior of mathematical systems, such as logic, artificial formal languages, and computer programming languages.