Rachycentridae vs order Percomorphi

Rachycentridae and order Percomorphi both are nouns.

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

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