contour vs dullness

contour and dullness both are nouns.

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

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

contour (noun)	dullness (noun)
any spatial attributes (especially as defined by outline)	lack of sensibility
a feature (or the order or arrangement of features) of anything having a complex structure	without sharpness or clearness of edge or point
a line drawn on a map connecting points of equal height	the quality of lacking interestingness
	a lack of visual brightness
	the quality of being slow to understand

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