parallelepiped vs parallelopiped

parallelepiped and parallelopiped both are nouns.

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

As nouns, parallelepiped and parallelopiped are synonyms defined as:

parallelepiped and parallelopiped: a prism whose bases are parallelograms

Other synonyms of parallelepiped include parallelepipedon, parallelopipedon.

parallelepiped (noun)	parallelopiped (noun)
a prism whose bases are parallelograms	a prism whose bases are parallelograms