desensitise vs deaf

desensitise is not a noun while deaf is a noun.

Word	Noun	Adjective	Verb	Adverb
desensitise	No	No	Yes	No
deaf	Yes	Yes	Yes	No

As verbs, deaf is a hyponym of desensitise; that is, deaf is a word with a more specific, narrower meaning than desensitise:

Other hyponyms of desensitise include benumb, blunt, dull, numb, bedaze, daze, stun, besot, stupefy, deafen.

desensitise (noun)	deaf (noun)
	people who have severe hearing impairments

desensitise (adjective)	deaf (adjective)
	lacking or deprived of the sense of hearing wholly or in part
	(usually followed by `to') unwilling or refusing to pay heed

desensitise (verb)	deaf (verb)
make insensitive	make or render deaf
cause not to be sensitive