Guangdong province vs Guangdong

Guangdong province and Guangdong both are nouns.

Word	Noun	Adjective	Verb	Adverb
Guangdong province	Yes	No	No	No
Guangdong	Yes	No	No	No

As nouns, Guangdong province and Guangdong are synonyms defined as:

Other synonyms of Guangdong province include Kwangtung.

Guangdong province (noun)	Guangdong (noun)
a province in southern China	a province in southern China