family Brassicaceae vs genus Stephanomeria

family Brassicaceae and genus Stephanomeria both are nouns.

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

family Brassicaceae (noun)	genus Stephanomeria (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	malheur wire lettuce