straightness vs contour

straightness and contour both are nouns.

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

As nouns, contour is a hypernym of straightness; that is, contour is a word with a broader meaning than straightness:

Other hypernyms of straightness include configuration, conformation, form, shape.

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

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