Guangzhou vs Kwangchow

Guangzhou and Kwangchow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Guangzhou	Yes	No	No	No
Kwangchow	Yes	No	No	No

As nouns, Guangzhou and Kwangchow are synonyms defined as:

Guangzhou and Kwangchow: a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port

Other synonyms of Guangzhou include Canton, Kuangchou.

Guangzhou (noun)	Kwangchow (noun)
a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port	a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port