family Brassicaceae vs genus Diplotaxis

family Brassicaceae and genus Diplotaxis both are nouns.

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

family Brassicaceae (noun)	genus Diplotaxis (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	wall rocket