naumachia vs naumachy

naumachia and naumachy both are nouns.

Word	Noun	Adjective	Verb	Adverb
naumachia	Yes	No	No	No
naumachy	Yes	No	No	No

As nouns, naumachia and naumachy are synonyms defined as:

naumachia and naumachy: a naval spectacle; a mock sea battle put on by the ancient Romans

naumachia (noun)	naumachy (noun)
a naval spectacle; a mock sea battle put on by the ancient Romans	a naval spectacle; a mock sea battle put on by the ancient Romans