auditory apparatus vs apparatus

auditory apparatus and apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
auditory apparatus	Yes	No	No	No
apparatus	Yes	No	No	No

As nouns, apparatus is a hypernym of auditory apparatus; that is, apparatus is a word with a broader meaning than auditory apparatus:

auditory apparatus: all of the components of the organ of hearing including the outer and middle and inner ears
apparatus: (anatomy) a group of body parts that work together to perform a given function

auditory apparatus (noun)	apparatus (noun)
all of the components of the organ of hearing including the outer and middle and inner ears	equipment designed to serve a specific function
	(anatomy) a group of body parts that work together to perform a given function