Rappahannock vs river

Rappahannock and river both are nouns.

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

Rappahannock (noun)	river (noun)
a river that flows across eastern Virginia into the Tidewater region	a large natural stream of water (larger than a creek)