How do you call a male witch?

[Segev]

That's awesome.
It really annoys me when in Merlin, the dragon keeps referring to him as a Warlock, I can imagine King Uther calling him that, but you'd think the Dragon would be a bit nicer...

To be fair, the dragon doesn't always seem to like Merlin.



But more to the point, while the term "oathbreaker" may be part of the etymology, it's worth noting that traditionally, the term "witch" was synonymous with "bride of Satan." I doubt most modern practitioners of the wiccan faith who call themselves "witches" would agree to that definition applying to them.

In Harry Potter, "witch" just means "female wizard," and "wizard" is the male of "witch." I don't know that Rowling ever used "warlock," nor technically "sorcerer" outside of the American version of the title of the first book. (And I really don't know why they changed "Philosopher's Stone" to "Sorcerer's Stone" for the American version.)

In Sabrina, the Teenaged Witch and Bewitched, "witch" is the name of the race/species as well as the women thereof, and the men are generally referred to as "warlocks" if it's not being used as a racial identifier. "He's a witch," might be said in the same way that an older text might indicate that "she's (of the race of) Man."

In D&D, "witch" was a hypothetical cross between wizard and adept written in the DMG to try to show how to design a class. (It wasn't very well done.) "Warlock" is a pretty cool class. In PF, "Witch" is a pretty cool class, and I think, if I squint at it right, it's what PF was trying to make in answer to the Warlock (what with the Hexes trying to match Invocations...but there's no Eldritch Blast equivalent).

If you decide the male form of "witch" is "warlock" in your fictional setting, the only people who will gainsay you are those who've tried to redefine the words for their own purposes, most of them related to a modern religion. And their redefinition is technically no more or less valid than yours in a real-world sense, and certainly is less so when it comes to discussing your fictional setting. (This is not to invalidate their choice of definition, either, just to indicate that they don't get to dictate to you what your terms in your fictional setting are. Especially not when their own definitions are new and deliberately friendlier than certain older ones.)