somesthesis vs somatosensory system

somesthesis and somatosensory system both are nouns.

Word	Noun	Adjective	Verb	Adverb
somesthesis	Yes	No	No	No
somatosensory system	Yes	No	No	No

As nouns, somesthesis and somatosensory system are synonyms defined as:

somesthesis and somatosensory system: the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs

somesthesis (noun)	somatosensory system (noun)
the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs	the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs