Jamaican vs Jamaica

Jamaican and Jamaica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jamaican	Yes	Yes	No	No
Jamaica	Yes	No	No	No

Jamaican (noun)	Jamaica (noun)
a native or inhabitant of Jamaica	a country on the island of Jamaica; became independent of England in 1962; much poverty; the major industry is tourism
	an island in the West Indies to the south of Cuba and to the west of Haiti

Jamaican (adjective)	Jamaica (adjective)
of or relating to Jamaica (the island or the country) or to its inhabitants