roundness vs configuration

roundness and configuration both are nouns.

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

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

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

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

roundness (noun)	configuration (noun)
the property possessed by a line or surface that is curved and not angular	any spatial attributes (especially as defined by outline)
the bodily property of being well rounded	an arrangement of parts or elements
the quality of being round numbers
the fullness of a tone of voice