Argun River vs Ergun He

Argun River and Ergun He both are nouns.

Word	Noun	Adjective	Verb	Adverb
Argun River	Yes	No	No	No
Ergun He	Yes	No	No	No

As nouns, Argun River and Ergun He are synonyms defined as:

Argun River and Ergun He: a river in eastern Asia that arises in China and flows northeast along the border between China and Russia to become a tributary of the Amur River

Other synonyms of Argun River include Argun.

Argun River (noun)	Ergun He (noun)
a river in eastern Asia that arises in China and flows northeast along the border between China and Russia to become a tributary of the Amur River	a river in eastern Asia that arises in China and flows northeast along the border between China and Russia to become a tributary of the Amur River