slasher vs attacker

slasher and attacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
slasher	Yes	No	No	No
attacker	Yes	No	No	No

As nouns, attacker is a hypernym of slasher; that is, attacker is a word with a broader meaning than slasher:

Other hypernyms of slasher include aggressor, assailant, assaulter.

slasher (noun)	attacker (noun)
a weapon (a sword or dagger) used for slashing	someone who attacks
someone who slashes another person