1) Correct pronunciation 2) Language 3) Oral communication 4) Pronunciation 5) Speech 6) Speech communication 7) Spoken communication 8) Spoken language 9) Study of pronunciation 10) Voice communication 
Orthoepy means the doctrine of correct pronunciation within a specific oral tradition. The term is from the Greek ὀρθοέπεια, from ὀρθός orthos `correct` and ἔπος epos `speech.` The antonym is cacoepy `bad or wrong pronunciation`. The pronunciation of the word orthoepy itself varies widely; the OED recognizes the variants...
study of correct pronunciation
• (n.) The art of uttering words correctly; a correct pronunciation of words; also, mode of pronunciation.
In linguistics, the study of pronunciation as it relates to spelling. A linguist who specializes in
Or'tho·ë·py noun [ Greek ...; 
orthoepy 1. The art of correct pronunciation. 2. Pronunciation in general.
noun the way a word or a language is customarily spoken; `the pronunciation of Chinese is difficult for foreigners`; `that is the correct pronunciation` noun a term formerly used for the part of phonology that dealt with the `correct` pronunciation of words and its relation to `correct` orthography
the study of correct pronunciation.