subphylum Vertebrata vs fish family

subphylum Vertebrata and fish family both are nouns.

Word	Noun	Adjective	Verb	Adverb
subphylum Vertebrata	Yes	No	No	No
fish family	Yes	No	No	No

subphylum Vertebrata (noun)	fish family (noun)
fishes, amphibians, reptiles, birds, mammals	any of various families of fish