Indigirka vs Indigirka River

Indigirka and Indigirka River both are nouns.

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

As nouns, Indigirka and Indigirka River are synonyms defined as:

Indigirka and Indigirka River: a river in far eastern Siberia that flows generally northward to the Arctic Ocean

Indigirka (noun)	Indigirka River (noun)
a river in far eastern Siberia that flows generally northward to the Arctic Ocean	a river in far eastern Siberia that flows generally northward to the Arctic Ocean