raper vs assaulter

raper and assaulter both are nouns.

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

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

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

raper (noun)	assaulter (noun)
someone who forces another to have sexual intercourse	someone who attacks