roundness vs conformation

roundness and conformation both are nouns.

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

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

roundness: the property possessed by a line or surface that is curved and not angular
conformation: any spatial attributes (especially as defined by outline)

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

roundness (noun)	conformation (noun)
the property possessed by a line or surface that is curved and not angular	acting according to certain accepted standards
the bodily property of being well rounded	any spatial attributes (especially as defined by outline)
the quality of being round numbers	a symmetrical arrangement of the parts of a thing
the fullness of a tone of voice