family Brassicaceae vs genus Matthiola

family Brassicaceae and genus Matthiola both are nouns.

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

family Brassicaceae (noun)	genus Matthiola (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	genus of Old World plants grown as ornamentals