It's a funny word,colloquially a witch is female, but if you ask anyone who is a witch, the males will tell you they're witches too.
Calling a male witch a warlock is highly offensive - a warlock is a traitor who has been expelled from his moot.
A wizard practices wizadry, which is a distinct school of magic, not practiced by witches.
Personally, I'm of a "The Gods are personified metaphors of natural phenomenon" kind of guy, so don't have to play silly little word games like these, but I do have to put up with lots of people who take their Gods rather more literally than I do tell me what they've been bickering about this week.