Vetluga vs river

Vetluga and river both are nouns.

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

Vetluga (noun)	river (noun)
a river in central Russia; flows generally southward into the Volga	a large natural stream of water (larger than a creek)