pakchoi vs pak choi

pakchoi and pak choi both are nouns.

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

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

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

Other synonyms of pakchoi include bok choi, bok choy, Brassica rapa chinensis, Chinese white cabbage.

pakchoi (noun)	pak choi (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