"Shi", "kirā" and "satsujin"
Kirātaigā
キラーアヒル Kirāahiru
Murderer, assasin, executioner, hit man (person), slayer, hunter.
I believe 'Shachi' is the word for it.
カッター Kattā
satsujin, satsugai, kyoukou, satsu, hitogoroshi
'Shi'
"Shi" is how you say death in Japanese. "Shi" is also how you say four Japanese, which is a reason why 4 is considered unlucky in Japan as it is said the same way as "death" is.
Kokushibyou
Red death
InterfectorEDIT:Interfectoris very literally a killerCarnifexis a butcher, as was also used for murderersCarnufexis an alternate spellingSiccariusis an assassinPercussoris another word for murderer
shinnu ame