Syntax semantics pragmatics morphology phonology
Phonology deals with the study of sound patterns of language. It also includes the distribution and pronunciation. It can be considered as the study of distinctive words in a language. It deals with the concept of a phoneme which is a distinctive or contrastive sound in a language.
Phonology is about the functional aspects of speech. It involves the actual sound of words which is constructed from the Phoneme. Phoneme is basically the smallest unit of pronunciation. Phonology also shares its attributes with other branches of linguistics like Pragmatics, Semantics, Syntax, Morphology and Phonetics. It becomes a basis of further research in subject areas like morphology and semantics. It involves the study of both phonemes and prosody (stress, rhythm and intonation) as subsystems of spoken language.
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Little Words: Their History, Phonology, Syntax, Semantics, Pragmatics, and Acquisition (Georgetown University Round Table on Languages and Linguistics)
Book (Georgetown University Press)