savage vs cruel

savage is a noun but cruel is not a noun.

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

As adjectives, savage and cruel are synonyms defined as:

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

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

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

savage (adjective)	cruel (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

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