celery cabbage vs Brassica rapa pekinensis

celery cabbage and Brassica rapa pekinensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
celery cabbage	Yes	No	No	No
Brassica rapa pekinensis	Yes	No	No	No

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

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

celery cabbage (noun)	Brassica rapa pekinensis (noun)
elongated head of crisp celery-like stalks and light green leaves	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