cruel vs savage

cruel is not a noun while savage is a noun.

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

As adjectives, cruel and savage are synonyms defined as:

cruel and savage: (of persons or their actions) able or disposed to inflict pain or suffering

Other synonyms of cruel include barbarous, brutal, fell, roughshod, vicious.

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

cruel (adjective)	savage (adjective)
(of persons or their actions) able or disposed to inflict pain or suffering	(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

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