contour vs straightness

contour and straightness both are nouns.

Word	Noun	Adjective	Verb	Adverb
contour	Yes	No	Yes	No
straightness	Yes	No	No	No

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

contour (noun)	straightness (noun)
any spatial attributes (especially as defined by outline)	a sexual attraction to (or sexual relations with) persons of the opposite sex
a feature (or the order or arrangement of features) of anything having a complex structure	freedom from crooks or curves or bends or angles
a line drawn on a map connecting points of equal height	(of hair) lack of a tendency to curl
	having honest intentions
	trueness of course toward a goal

contour (verb)	straightness (verb)
form the contours of