raper vs aggressor

raper and aggressor both are nouns.

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

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

Other hypernyms of raper include assailant, assaulter, attacker, criminal, crook, felon, malefactor, outlaw.

raper (noun)	aggressor (noun)
someone who forces another to have sexual intercourse	someone who attacks
	a confident assertive person who acts as instigator