hearing vs auditory system

hearing and auditory system both are nouns.

Word	Noun	Adjective	Verb	Adverb
hearing	Yes	Yes	No	No
auditory system	Yes	No	No	No

hearing (noun)	auditory system (noun)
the act of hearing attentively	the sensory system for hearing
(law) a proceeding (usually by a court) where evidence is taken for the purpose of determining an issue of fact and reaching a decision based on that evidence
the ability to hear; the auditory faculty
a session (of a committee or grand jury) in which witnesses are called and testimony is taken
the range within which a voice can be heard
an opportunity to state your case and be heard

hearing (adjective)	auditory system (adjective)
able to perceive sound