napa vs Brassica rapa pekinensis

napa and Brassica rapa pekinensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
napa	Yes	No	No	No
Brassica rapa pekinensis	Yes	No	No	No

As nouns, napa and Brassica rapa pekinensis are synonyms defined as:

napa 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 napa include celery cabbage, Chinese cabbage, pe-tsai.

napa (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