Guangzhou vs Canton

Guangzhou and Canton both are nouns.

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

As nouns, Guangzhou and Canton are synonyms defined as:

Guangzhou and Canton: 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 Kuangchou, Kwangchow.

Guangzhou (noun)	Canton (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