regular convex polyhedron vs regular polyhedron

regular convex polyhedron and regular polyhedron both are nouns.

Word	Noun	Adjective	Verb	Adverb
regular convex polyhedron	Yes	No	No	No
regular polyhedron	Yes	No	No	No

As nouns, regular convex polyhedron and regular polyhedron are synonyms defined as:

regular convex polyhedron and regular polyhedron: any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent

Other synonyms of regular convex polyhedron include ideal solid, Platonic body, Platonic solid, regular convex solid.

regular convex polyhedron (noun)	regular polyhedron (noun)
any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent	any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent