curve vs straight line

curve and straight line both are nouns.

Word	Noun	Adjective	Verb	Adverb
curve	Yes	No	Yes	No
straight line	Yes	No	No	No

curve (noun)	straight line (noun)
a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter	a line traced by a point traveling in a constant direction; a line of zero curvature
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

curve (verb)	straight line (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