prism vs polyhedron

prism and polyhedron both are nouns.

Word	Noun	Adjective	Verb	Adverb
prism	Yes	No	No	No
polyhedron	Yes	No	No	No

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

prism: a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
polyhedron: a solid figure bounded by plane polygons or faces

prism (noun)	polyhedron (noun)
optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image	a solid figure bounded by plane polygons or faces
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms