family Brassicaceae vs genus Nasturtium

family Brassicaceae and genus Nasturtium both are nouns.

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

family Brassicaceae (noun)	genus Nasturtium (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	a genus of seven plant species in the family Brassicaceae (Nasturtium)