river vs Willamette

river and Willamette both are nouns.

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

river (noun)	Willamette (noun)
a large natural stream of water (larger than a creek)	a river in western Oregon that flows north into the Columbia River near Portland