Arabia vs Arabian

Arabia and Arabian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arabia	Yes	No	No	No
Arabian	Yes	Yes	No	No

Arabia (noun)	Arabian (noun)
a peninsula between the Red Sea and the Persian Gulf; strategically important for its oil resources	a spirited graceful and intelligent riding horse native to Arabia
	a member of a Semitic people originally from the Arabian peninsula and surrounding territories who speaks Arabic and who inhabits much of the Middle East and northern Africa

Arabia (adjective)	Arabian (adjective)
	of or relating to Arabian horses
	relating to or associated with Arabia or its people