vadhaka : [m.] an executioner; one who inflicts punishment.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Vadhaka [fr. vadh] slaying, killing; murderous; a murderer S iii.112 (in simile); iv.173 (id.); A iv.92 (id.); Th 2, 347; D iii.72 (˚citta); KhA 27; VvA 72 (˚cetanā murderous intention); Vism 230, 231 (in sim.); Sdhp 58. <-> f. vadhikā J v.425 (pl. ˚āyo).

Pali-English Dictionary, TW Rhys Davids, William Stede,

vádhaka mfn. killing, destructive, U9. ii, 36

• intending to strike or kill Jātakam

• m. a murderer, assassin MBh. VarBṛS. Rājat

• an executioner, hangman Kathās

• a partic. sort of reed or rush AV. ŚBr

Sanskrit-English Dictionary, by M. Monier William