pe-tsai vs Brassica rapa pekinensis

pe-tsai and Brassica rapa pekinensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
pe-tsai	Yes	No	No	No
Brassica rapa pekinensis	Yes	No	No	No

As nouns, pe-tsai and Brassica rapa pekinensis are synonyms defined as:

pe-tsai and Brassica rapa pekinensis: plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia

Other synonyms of pe-tsai include celery cabbage, Chinese cabbage, napa.

pe-tsai (noun)	Brassica rapa pekinensis (noun)
plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia	plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia