river vs falls

river and falls both are nouns.

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

river (noun)	falls (noun)
a large natural stream of water (larger than a creek)	a steep descent of the water of a river
	the petals or sepals of a flower that bend downward (especially the outer perianth of an iris)