savage vs aggressor

savage and aggressor both are nouns.

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

As nouns, aggressor is a hypernym of savage; that is, aggressor is a word with a broader meaning than savage:

Other hypernyms of savage include assailant, assaulter, attacker.

savage (noun)	aggressor (noun)
a member of an uncivilized people	someone who attacks
a cruelly rapacious person	a confident assertive person who acts as instigator

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