napa vs cruciferous plant

napa and cruciferous plant both are nouns.

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

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

napa: plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia
cruciferous plant: any of various plants of the family Cruciferae

Other hypernyms of napa include crucifer.

napa (noun)	cruciferous plant (noun)
plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia	any of various plants of the family Cruciferae