pakchoi vs crucifer

pakchoi and crucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pakchoi	Yes	No	No	No
crucifer	Yes	No	No	No

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

pakchoi: Asiatic plant grown for its cluster of edible white stalks with dark green leaves
crucifer: any of various plants of the family Cruciferae

Other hypernyms of pakchoi include cruciferous plant.

pakchoi (noun)	crucifer (noun)
Asiatic plant grown for its cluster of edible white stalks with dark green leaves	any of various plants of the family Cruciferae