parallelepiped vs prism

parallelepiped and prism both are nouns.

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

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

parallelepiped: a prism whose bases are parallelograms
prism: a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms

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