family Brassicaceae vs genus Alyssum

family Brassicaceae and genus Alyssum both are nouns.

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

family Brassicaceae (noun)	genus Alyssum (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	a genus of the family Cruciferae, containing annual and perennial herbaceous plants or small shrubs, growing to 10-100 cm tall, with oblong-oval leaves and yellow or white flowers (Alyssum)