Neva vs Neva River

Neva and Neva River both are nouns.

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

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

Neva and Neva River: a river in northwestern Russia flowing generally west into the Gulf of Finland

Neva (noun)	Neva River (noun)
a river in northwestern Russia flowing generally west into the Gulf of Finland	a river in northwestern Russia flowing generally west into the Gulf of Finland