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Warlock (profession)
From Discworld & Pratchett Wiki
Warlocks are rarely seen on the Discworld, described by some as 'male witches' and by Granny Weatherwax as 'silly men'.
A warlock would be a man who instead of choosing the showy, geometrical magic of wizardry, chose the 'headology' and natural magic of witchcraft. Granny does not hold with this, believing men to be incapable of thinking in the right way. It's possible that if ever a warlock did show up, she'd quickly make him see the error of his ways.
See Wikipedia for the Roundworld version of Warlocks
