hypoesthesia vs impairment

hypoesthesia and impairment both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypoesthesia	Yes	No	No	No
impairment	Yes	No	No	No

As nouns, impairment is a hypernym of hypoesthesia; that is, impairment is a word with a broader meaning than hypoesthesia:

hypoesthesia: impairment of tactile sensitivity; decrease of sensitivity
impairment: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of hypoesthesia include disability, disablement, handicap.

hypoesthesia (noun)	impairment (noun)
impairment of tactile sensitivity; decrease of sensitivity	damage that results in a reduction of strength or quality
	the act of making something futile and useless (as by routine)
	the occurrence of a change for the worse
	the condition of being unable to perform as a consequence of physical or mental unfitness
	a symptom of reduced quality or strength