Aare River vs Aar

Aare River and Aar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aare River	Yes	No	No	No
Aar	Yes	No	No	No

As nouns, Aare River and Aar are synonyms defined as:

Aare River and Aar: a river in north central Switzerland that runs northeast into the Rhine

Other synonyms of Aare River include Aare.

Aare River (noun)	Aar (noun)
a river in north central Switzerland that runs northeast into the Rhine	a river in north central Switzerland that runs northeast into the Rhine