Olympian vs Olympia

Olympian and Olympia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Olympian	Yes	Yes	No	No
Olympia	Yes	No	No	No

Olympian (noun)	Olympia (noun)
an athlete who participates in the Olympic games	capital of the state of Washington; located in western Washington on Puget Sound
a classical Greek god after the overthrow of the Titans	a plain in Greece in the northwestern Peloponnese; the chief sanctuary of Zeus and the site of the original Olympian Games

Olympian (adjective)	Olympia (adjective)
of or pertaining to the greater gods of ancient Greece whose abode was Mount Olympus
of the region of Olympia in Greece or its inhabitants