subphylum Craniata vs amphibian family

subphylum Craniata and amphibian family both are nouns.

Word	Noun	Adjective	Verb	Adverb
subphylum Craniata	Yes	No	No	No
amphibian family	Yes	No	No	No

subphylum Craniata (noun)	amphibian family (noun)
fishes, amphibians, reptiles, birds, mammals	any family of amphibians