Carnifex

·noun The public executioner at Rome, who executed persons of the lowest rank; hence, an executioner or hangman.

carnifex
carnĭfex or carnŭfex, fĭcis, m. [v. caro-facio], I an executioner , hangman , Plaut. Bacch. 4, ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
carnifex
carnifex or carnufex ficis, m caro + 2 FAC-, an executioner, hangman : carnificum cruciamenta: iac...

An Elementary Latin Dictionary