dullness vs conformation

dullness and conformation both are nouns.

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

As nouns, conformation is a hypernym of dullness; that is, conformation is a word with a broader meaning than dullness:

Other hypernyms of dullness include configuration, contour, form, shape.

dullness (noun)	conformation (noun)
lack of sensibility	acting according to certain accepted standards
without sharpness or clearness of edge or point	any spatial attributes (especially as defined by outline)
the quality of lacking interestingness	a symmetrical arrangement of the parts of a thing
a lack of visual brightness
the quality of being slow to understand