hearing vs sensory system

hearing and sensory system both are nouns.

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

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

Other hypernyms of hearing include modality, sense modality, exteroception.

hearing (noun)	sensory system (noun)
the act of hearing attentively	the body's system of sense organs
(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	a particular sense
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)	sensory system (adjective)
able to perceive sound