river vs Indigirka

river and Indigirka both are nouns.

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

river (noun)	Indigirka (noun)
a large natural stream of water (larger than a creek)	a river in far eastern Siberia that flows generally northward to the Arctic Ocean