Canton vs Guangzhou

Canton and Guangzhou both are nouns.

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

As nouns, Canton and Guangzhou are synonyms defined as:

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

Other synonyms of Canton include Kuangchou, Kwangchow.

Canton (noun)	Guangzhou (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