madwort vs cruciferous plant

madwort and cruciferous plant both are nouns.

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

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

madwort: any garden plant of the genus Alyssum having clusters of small yellow or white flowers
cruciferous plant: any of various plants of the family Cruciferae

Other hypernyms of madwort include crucifer.

madwort (noun)	cruciferous plant (noun)
any garden plant of the genus Alyssum having clusters of small yellow or white flowers	any of various plants of the family Cruciferae