skeleton vs skeletal

skeleton is a noun but skeletal is not a noun.

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

skeleton (noun)	skeletal (noun)
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

skeleton (adjective)	skeletal (adjective)
	of or relating to or forming or attached to a skeleton
	very thin especially from disease or hunger or cold