doomsman
One who renders judgement (e.g. a judge, magistrate, or arbiter); an umpire.
archaic, historical
The fire shall burn about the Doomsman.
One who carries out a judgement or sentencing; executioner.
rare
At the place of execution, Dorothea begged the doomsman to tarry a little, and kneeling by the block, she raised her hands to heaven and prayed earnestly.
Where it comes from
From Middle English domesman, equivalent to doom + -s- + man.
Adapted from the Wiktionary entry doomsman (CC BY-SA 4.0).