A hunter is someone who seeks, pursues, or looks for something. Some hunters hunt deer but if you're a bargain hunter, you love to search department stores and yard sales for really good deals.
Besides hunting for bargains, or for ghosts in her grandparents' attic, a hunter is also a person who enjoys the sport of pursuing and killing game animals and birds. Some hunters hunt for food, while others do it for fun. In Old English, the word was hunta, from huntian, "chase game," which is related to hentan, "to seize."