Ithaki vs Ithaca

Ithaki and Ithaca both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ithaki	Yes	No	No	No
Ithaca	Yes	No	No	No

As nouns, Ithaki and Ithaca are synonyms defined as:

Ithaki and Ithaca: a Greek island to the west of Greece; in Homeric legend Odysseus was its king

Ithaki (noun)	Ithaca (noun)
a Greek island to the west of Greece; in Homeric legend Odysseus was its king	a Greek island to the west of Greece; in Homeric legend Odysseus was its king
	a college town in central New York on Lake Cayuga