river vs curve

river and curve both are nouns.

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

river (noun)	curve (noun)
a large natural stream of water (larger than a creek)	a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter
	curved segment (of a road or river or railroad track etc.)
	the property possessed by the curving of a line or surface
	a line on a graph representing data
	the trace of a point whose direction of motion changes

river (verb)	curve (verb)
	form a curl, curve, or kink
	turn sharply; change direction abruptly
	form an arch or curve
	bend or cause to bend
	extend in curves and turns