proprioceptor vs nerve ending

proprioceptor and nerve ending both are nouns.

Word	Noun	Adjective	Verb	Adverb
proprioceptor	Yes	No	No	No
nerve ending	Yes	No	No	No

As nouns, nerve ending is a hypernym of proprioceptor; that is, nerve ending is a word with a broader meaning than proprioceptor:

proprioceptor: special nerve endings in the muscles and tendons and other organs that respond to stimuli regarding the position and movement of the body
nerve ending: the terminal structure of an axon that does not end at a synapse

Other hypernyms of proprioceptor include nerve end.

proprioceptor (noun)	nerve ending (noun)
special nerve endings in the muscles and tendons and other organs that respond to stimuli regarding the position and movement of the body	the terminal structure of an axon that does not end at a synapse