desensitisation vs decrease

desensitisation and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
desensitisation	Yes	No	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of desensitisation; that is, decrease is a word with a broader meaning than desensitisation:

Other hypernyms of desensitisation include decrement.

desensitisation (noun)	decrease (noun)
the process of reducing sensitivity	the act of decreasing or reducing something
	the amount by which something decreases
	a change downward
	a process of becoming smaller or shorter

desensitisation (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller