Willamette vs river

Willamette and river both are nouns.

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

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