brussels sprout vs crucifer

brussels sprout and crucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
brussels sprout	Yes	No	No	No
crucifer	Yes	No	No	No

As nouns, crucifer is a hypernym of brussels sprout; that is, crucifer is a word with a broader meaning than brussels sprout:

brussels sprout: plant grown for its stout stalks of edible small green heads resembling diminutive cabbages
crucifer: any of various plants of the family Cruciferae

Other hypernyms of brussels sprout include cruciferous plant.

brussels sprout (noun)	crucifer (noun)
plant grown for its stout stalks of edible small green heads resembling diminutive cabbages	any of various plants of the family Cruciferae