Cruciferae vs cruciferous

Cruciferae is a noun but cruciferous is not a noun.

Word	Noun	Adjective	Verb	Adverb
Cruciferae	Yes	No	No	No
cruciferous	No	Yes	No	No

Cruciferae (noun)	cruciferous (noun)
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives

Cruciferae (adjective)	cruciferous (adjective)
	of or relating to or belonging to the plant family Cruciferae