Thessalia vs Thessaly

Thessalia and Thessaly both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thessalia	Yes	No	No	No
Thessaly	Yes	No	No	No

As nouns, Thessalia and Thessaly are synonyms defined as:

Thessalia and Thessaly: a fertile plain on the Aegean Sea in east central Greece; Thessaly was a former region of ancient Greece

Thessalia (noun)	Thessaly (noun)
a fertile plain on the Aegean Sea in east central Greece; Thessaly was a former region of ancient Greece	a fertile plain on the Aegean Sea in east central Greece; Thessaly was a former region of ancient Greece