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