スレイヤー /su rai ya/ or 殺害者 /sa tsu gai sha/.
saigo no enjerusureija
男の殺害 Otoko no satsugai
The translation for "man slayer" in Japanese is 人殺し (hitogoroshi).
永住者の殺人者 : 'eijuusha no satsujinsha'.
it is pronounce sudikakio
悪魔殺害者を抹消してください
Trucidator
There is no such thing.
Depending on what you mean it could differ. スレイヤー /su rei ya/ is a Japanese term inserted from English which can be used generally, i.e. as a proper noun or just a noun meaning killer etc.
殺害者 Satsugai-sha
Drago Uccisore
Well, I do not know your slayer level, but I can say Slayer is one of the most profitable and exciting skills to train your combat. Slayer is a slow skill so I would be uncertain on how long you are willing to fight monsters. The only way to train Slayer is by getting Slayer tasks from the Slayer masters so try there first. Speaking to the Slayer master in the Edgeville Dungeon should be good for you. If your Slayer level is low then try speaking to the lower-level Slayer masters first and then build up to better ones.