family Brassicaceae vs Arabidopsis

family Brassicaceae and Arabidopsis both are nouns.

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

family Brassicaceae (noun)	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