skeletal system vs skeleton

skeletal system and skeleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
skeletal system	Yes	No	No	No
skeleton	Yes	No	No	No

As nouns, skeletal system and skeleton are synonyms defined as:

skeletal system and skeleton: the hard structure (bones and cartilages) that provides a frame for the body of an animal

Other synonyms of skeletal system include frame, systema skeletale.

skeletal system (noun)	skeleton (noun)
the hard structure (bones and cartilages) that provides a frame for the body of an animal	the internal supporting structure that gives an artifact its shape
	the hard structure (bones and cartilages) that provides a frame for the body of an animal
	a scandal that is kept secret
	something reduced to its minimal form