Rappahannock vs Rappahannock River

Rappahannock and Rappahannock River both are nouns.

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

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

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

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