river vs Kissimmee

river and Kissimmee both are nouns.

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

river (noun)	Kissimmee (noun)
a large natural stream of water (larger than a creek)	a river of central Florida that flows southward to Lake Okeechobee