pak choi vs crucifer

pak choi and crucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pak choi	Yes	No	No	No
crucifer	Yes	No	No	No

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

pak choi: 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 pak choi include cruciferous plant.

pak choi (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