pak choi vs pakchoi

pak choi and pakchoi both are nouns.

Word	Noun	Adjective	Verb	Adverb
pak choi	Yes	No	No	No
pakchoi	Yes	No	No	No

As nouns, pak choi and pakchoi are synonyms defined as:

pak choi and pakchoi: 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, Chinese white cabbage.

pak choi (noun)	pakchoi (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