Note: The form 'phonetic' is used as a modifier.
1.
In linguistics, ~ is the study of speech sounds.
N-UNCOUNT
2.
Phonetic means relating to the sound of a word or to the sounds that are used in languages.
...the Japanese phonetic system, with its relatively few, simple sounds...
ADJ: usu ADJ n
phonetically
It’s wonderful to watch her now going through things phonetically learning how to spell things.
ADV: ADV with v