Rappahannock River vs Rappahannock

Rappahannock River and Rappahannock both are nouns.

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

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

Rappahannock River and Rappahannock: a river that flows across eastern Virginia into the Tidewater region

Rappahannock River (noun)	Rappahannock (noun)
a river that flows across eastern Virginia into the Tidewater region	a river that flows across eastern Virginia into the Tidewater region