rapist vs aggressor

rapist and aggressor both are nouns.

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

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

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

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