The study of language sounds is called wat

The word 'phonology' (as in the phonology of English) can also refer to the phonological system (sound system) of a given language. This is one of the fundamental systems which a language is considered to comprise, like its syntax and its vocabulary. Phonology is often distinguished from phonetics.

Hope it helps have a good day <3!

It is called Phonology. I really hope that helps!