phonetic alphabet vs ABCs

phonetic alphabet and ABCs both are nouns.

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

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

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

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

phonetic alphabet (noun)	ABCs (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