phonetic alphabet vs sound alphabet

phonetic alphabet and sound alphabet both are nouns.

Word	Noun	Adjective	Verb	Adverb
phonetic alphabet	Yes	No	No	No
sound alphabet	Yes	No	No	No

As nouns, phonetic alphabet and sound alphabet are synonyms defined as:

phonetic alphabet and sound alphabet: an alphabet of characters intended to represent specific sounds of speech

phonetic alphabet (noun)	sound alphabet (noun)
an alphabet of characters intended to represent specific sounds of speech	an alphabet of characters intended to represent specific sounds of speech