river vs Demerara

river and Demerara both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Demerara	Yes	No	No	No

river (noun)	Demerara (noun)
a large natural stream of water (larger than a creek)	a former Dutch colony in South America; now a part of Guyana
	a river in northern Guyana that flows northward into the Atlantic