parallelepipedon vs parallelopipedon

parallelepipedon and parallelopipedon both are nouns.

Word	Noun	Adjective	Verb	Adverb
parallelepipedon	Yes	No	No	No
parallelopipedon	Yes	No	No	No

As nouns, parallelepipedon and parallelopipedon are synonyms defined as:

parallelepipedon and parallelopipedon: a prism whose bases are parallelograms

Other synonyms of parallelepipedon include parallelepiped, parallelopiped.

parallelepipedon (noun)	parallelopipedon (noun)
a prism whose bases are parallelograms	a prism whose bases are parallelograms