photosensitivity vs sensitivity

photosensitivity and sensitivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
photosensitivity	Yes	No	No	No
sensitivity	Yes	No	No	No

As nouns, sensitivity is a hypernym of photosensitivity; that is, sensitivity is a word with a broader meaning than photosensitivity:

photosensitivity: sensitivity to the action of radiant energy
sensitivity: (physiology) responsiveness to external stimuli; the faculty of sensation

Other hypernyms of photosensitivity include sensibility, sensitiveness.

photosensitivity (noun)	sensitivity (noun)
sensitivity to the action of radiant energy	the ability to respond to physical stimuli or to register small physical amounts or differences
	the ability to respond to affective changes in your interpersonal environment
	(physiology) responsiveness to external stimuli; the faculty of sensation
	sensitivity to emotional feelings (of self and others)
	susceptibility to a pathogen