pe-tsai vs crucifer

pe-tsai and crucifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pe-tsai	Yes	No	No	No
crucifer	Yes	No	No	No

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

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

Other hypernyms of pe-tsai include cruciferous plant.

pe-tsai (noun)	crucifer (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