family Brassicaceae vs genus Arabis

family Brassicaceae and genus Arabis both are nouns.

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

family Brassicaceae (noun)	genus Arabis (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	annual to perennial woody herbs of temperate North America, Europe and Asia: rockcress