phonology

n. study of speech sounds and rules of pronunciation

Phonology (Greek φωνή (phōnē), voice, sound + λόγος (lógos), word, speech, subject of discussion), is a subfield of linguistics which studies the sound system of a specific language (or languages). Whereas phonetics is about the physical production and perception of the sounds of speech, phonology describes the way sounds function within a given language or across languages.
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Phonology /pho·nol·o·gy/ the science of vocal sounds.phonolog´ical [more]Phonology - Community and Resources

Noun
1. the study of the sound system of a given language and the analysis and classification of its phonemes
(synonym) phonemics
(hypernym) synchronic linguistics, descriptive linguistics
(hyponym) orthoepy
(class) vocalic, syllabic

(n.)
The science or doctrine of the elementary sounds uttered by the human voice in speech, including the various distinctions, modifications, and combinations of tones; phonetics. Also, a treatise on sounds.