narrowing vs contour

narrowing and contour both are nouns.

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

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

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

narrowing (noun)	contour (noun)
the act of making something narrower	any spatial attributes (especially as defined by outline)
an instance of becoming narrow	a feature (or the order or arrangement of features) of anything having a complex structure
a decrease in width	a line drawn on a map connecting points of equal height

narrowing (adjective)	contour (adjective)
(of circumstances) tending to constrict freedom
becoming gradually narrower

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