Percomorphi vs family Rachycentridae

Percomorphi and family Rachycentridae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Percomorphi	Yes	No	No	No
family Rachycentridae	Yes	No	No	No

Percomorphi (noun)	family Rachycentridae (noun)
one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna	family of pelagic fishes containing solely the cobia