uncivilized vs savage

uncivilized is not a noun while savage is a noun.

Word	Noun	Adjective	Verb	Adverb
uncivilized	No	Yes	No	No
savage	Yes	Yes	Yes	No

As adjectives, uncivilized and savage are synonyms defined as:

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

uncivilized (noun)	savage (noun)
	a member of an uncivilized people
	a cruelly rapacious person

uncivilized (adjective)	savage (adjective)
without civilizing influences	(of persons or their actions) able or disposed to inflict pain or suffering
	without civilizing influences
	marked by extreme and violent energy
	wild and menacing

uncivilized (verb)	savage (verb)
	criticize harshly or violently
	attack brutally and fiercely