reactivity vs sensibility

reactivity and sensibility both are nouns.

Word	Noun	Adjective	Verb	Adverb
reactivity	Yes	No	No	No
sensibility	Yes	No	No	No

As nouns, sensibility is a hypernym of reactivity; that is, sensibility is a word with a broader meaning than reactivity:

reactivity: responsive to stimulation
sensibility: (physiology) responsiveness to external stimuli; the faculty of sensation

Other hypernyms of reactivity include sensitiveness, sensitivity.

reactivity (noun)	sensibility (noun)
responsive to stimulation	mental responsiveness and awareness
ready susceptibility to chemical change	(physiology) responsiveness to external stimuli; the faculty of sensation
	refined sensitivity to pleasurable or painful impressions