desensitising vs sensitivity

desensitising is not a noun while sensitivity is a noun.

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

desensitising (noun)	sensitivity (noun)
	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

desensitising (adjective)	sensitivity (adjective)
making less susceptible or sensitive to either physical or emotional stimuli