Cruciferae vs genus Brassica

Cruciferae and genus Brassica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cruciferae	Yes	No	No	No
genus Brassica	Yes	No	No	No

Cruciferae (noun)	genus Brassica (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives	mustards: cabbages, cauliflowers, turnips, etc.