Brassica perviridis vs crucifer

Brassica perviridis and crucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Brassica perviridis	Yes	No	No	No
crucifer	Yes	No	No	No

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

Brassica perviridis: Asiatic plant cultivated for its swollen root crown and edible foliage
crucifer: any of various plants of the family Cruciferae

Other hypernyms of Brassica perviridis include cruciferous plant.

Brassica perviridis (noun)	crucifer (noun)
Asiatic plant cultivated for its swollen root crown and edible foliage	any of various plants of the family Cruciferae