rectilinearity vs contour

rectilinearity and contour both are nouns.

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

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

rectilinearity: the property possessed by a line or surface that is rectilinear, straight.
contour: any spatial attributes (especially as defined by outline)

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

rectilinearity (noun)	contour (noun)
the property possessed by a line or surface that is rectilinear, straight.	any spatial attributes (especially as defined by outline)
	a feature (or the order or arrangement of features) of anything having a complex structure
	a line drawn on a map connecting points of equal height

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