sound alphabet vs phonetic alphabet

sound alphabet and phonetic alphabet both are nouns.

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

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

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

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