Indigirka vs river

Indigirka and river both are nouns.

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

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