subphylum Vertebrata vs fish genus

subphylum Vertebrata and fish genus both are nouns.

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

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