Irtish vs Irtish River

Irtish and Irtish River both are nouns.

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

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

Irtish and Irtish River: an Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River

Other synonyms of Irtish include Irtysh, Irtysh River.

Irtish (noun)	Irtish River (noun)
an Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River	an Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River