hyperacusia vs hearing disorder

hyperacusia and hearing disorder both are nouns.

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

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

hyperacusia: abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels
hearing disorder: impairment of the sense of hearing

Other hypernyms of hyperacusia include hearing impairment.

hyperacusia (noun)	hearing disorder (noun)
abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels	impairment of the sense of hearing