pak choi vs Chinese white cabbage

pak choi and Chinese white cabbage both are nouns.

Word	Noun	Adjective	Verb	Adverb
pak choi	Yes	No	No	No
Chinese white cabbage	Yes	No	No	No

As nouns, pak choi and Chinese white cabbage are synonyms defined as:

pak choi and Chinese white cabbage: Asiatic plant grown for its cluster of edible white stalks with dark green leaves

Other synonyms of pak choi include bok choi, bok choy, Brassica rapa chinensis, pakchoi.

pak choi (noun)	Chinese white cabbage (noun)
Asiatic plant grown for its cluster of edible white stalks with dark green leaves	Asiatic plant grown for its cluster of edible white stalks with dark green leaves