cabbage vs cruciferous plant

cabbage and cruciferous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
cabbage	Yes	No	Yes	No
cruciferous plant	Yes	No	No	No

As nouns, cruciferous plant is a hypernym of cabbage; that is, cruciferous plant is a word with a broader meaning than cabbage:

cabbage: any of various cultivars of the genus Brassica oleracea grown for their edible leaves or flowers
cruciferous plant: any of various plants of the family Cruciferae

Other hypernyms of cabbage include crucifer.

cabbage (noun)	cruciferous plant (noun)
any of various types of cabbage	any of various plants of the family Cruciferae
any of various cultivars of the genus Brassica oleracea grown for their edible leaves or flowers
informal terms for money

cabbage (verb)	cruciferous plant (verb)
make off with belongings of others