barbaric vs barbarian

barbaric is not a noun while barbarian is a noun.

Word	Noun	Adjective	Verb	Adverb
barbaric	No	Yes	No	No
barbarian	Yes	Yes	No	No

As adjectives, barbaric and barbarian are synonyms defined as:

Other synonyms of barbaric include savage, uncivilised, uncivilized, wild.

barbaric (noun)	barbarian (noun)
	a member of an uncivilized people
	a crude uncouth ill-bred person lacking culture or refinement

barbaric (adjective)	barbarian (adjective)
without civilizing influences	without civilizing influences
unrestrained and crudely rich