ideal solid vs polyhedron

ideal solid and polyhedron both are nouns.

Word	Noun	Adjective	Verb	Adverb
ideal solid	Yes	No	No	No
polyhedron	Yes	No	No	No

As nouns, polyhedron is a hypernym of ideal solid; that is, polyhedron is a word with a broader meaning than ideal solid:

ideal solid: any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
polyhedron: a solid figure bounded by plane polygons or faces

ideal solid (noun)	polyhedron (noun)
any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent	a solid figure bounded by plane polygons or faces