Weser River vs Weser

Weser River and Weser both are nouns.

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

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

Weser River and Weser: a river in northwestern Germany that flows northward to the North Sea near Bremerhaven

Weser River (noun)	Weser (noun)
a river in northwestern Germany that flows northward to the North Sea near Bremerhaven	a river in northwestern Germany that flows northward to the North Sea near Bremerhaven