family Brassicaceae vs genus Arabidopsis

family Brassicaceae and genus Arabidopsis both are nouns.

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

family Brassicaceae (noun)	genus Arabidopsis (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	a genus of the mustard family having white or yellow or purplish flowers; closely related to genus Arabis