curve vs spiral

curve and spiral both are nouns.

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

As nouns, spiral is a hyponym of curve; that is, spiral is a word with a more specific, narrower meaning than curve:

curve: the trace of a point whose direction of motion changes
spiral: a plane curve traced by a point circling about the center but at increasing distances from the center

As verbs, spiral is a hyponym of curve; that is, spiral is a word with a more specific, narrower meaning than curve:

Other hyponyms of curve include circumvolute, snake.

curve (noun)	spiral (noun)
a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter	flying downward in a helical path with a large radius
curved segment (of a road or river or railroad track etc.)	a structure consisting of something wound in a continuous series of loops
the property possessed by the curving of a line or surface	ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center
a line on a graph representing data	a continuously accelerating change in the economy
the trace of a point whose direction of motion changes	a plane curve traced by a point circling about the center but at increasing distances from the center
	a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle

curve (adjective)	spiral (adjective)
	in the shape of a coil

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