family Brassicaceae vs genus Cheiranthus

family Brassicaceae and genus Cheiranthus both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Brassicaceae	Yes	No	No	No
genus Cheiranthus	Yes	No	No	No

family Brassicaceae (noun)	genus Cheiranthus (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	Old World perennial plants grown for their showy flowers