hearing disorder vs impairment

hearing disorder and impairment both are nouns.

Word	Noun	Adjective	Verb	Adverb
hearing disorder	Yes	No	No	No
impairment	Yes	No	No	No

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

hearing disorder: impairment of the sense of hearing
impairment: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of hearing disorder include disability, disablement, handicap.

hearing disorder (noun)	impairment (noun)
impairment of the sense of hearing	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