refractiveness vs bending

refractiveness and bending both are nouns.

Word	Noun	Adjective	Verb	Adverb
refractiveness	Yes	No	No	No
bending	Yes	No	No	No

As nouns, bending is a hypernym of refractiveness; that is, bending is a word with a broader meaning than refractiveness:

refractiveness: the physical property of a medium as determined by its index of refraction
bending: the property of being bent or deflected

Other hypernyms of refractiveness include deflection, deflexion.

refractiveness (noun)	bending (noun)
the physical property of a medium as determined by its index of refraction	the act of bending something
	the property of being bent or deflected
	movement that causes the formation of a curve