Ithaca vs Ithaki

Ithaca and Ithaki both are nouns.

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

As nouns, Ithaca and Ithaki are synonyms defined as:

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

Ithaca (noun)	Ithaki (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