naumachy vs naumachia

naumachy and naumachia both are nouns.

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

As nouns, naumachy and naumachia are synonyms defined as:

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

naumachy (noun)	naumachia (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