phonetic alphabet vs ABC

phonetic alphabet and ABC both are nouns.

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

As nouns, ABC is a hypernym of phonetic alphabet; that is, ABC is a word with a broader meaning than phonetic alphabet:

phonetic alphabet: an alphabet of characters intended to represent specific sounds of speech
ABC: a character set that includes letters and is used to write a language

Other hypernyms of phonetic alphabet include ABC's, ABCs, alphabet.

phonetic alphabet (noun)	ABC (noun)
an alphabet of characters intended to represent specific sounds of speech	a character set that includes letters and is used to write a language