skeleton vs skeletal structure

skeleton and skeletal structure both are nouns.

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

skeleton (noun)	skeletal structure (noun)
the internal supporting structure that gives an artifact its shape	any structure created by the skeleton of an organism
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