genus Arabidopsis vs Brassicaceae

genus Arabidopsis and Brassicaceae both are nouns.

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

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