Ouse vs river

Ouse and river both are nouns.

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

Ouse (noun)	river (noun)
a river in northeastern England that flows generally southeastward to join the Trent River and form the Humber	a large natural stream of water (larger than a creek)