(n.) An evil or mischievous spirit; a playful or malicious elf; a frightful phantom; a gnome.

Ariel Befind Corrigan Finnbeara Mab Oberon Titania banshee brownie cluricaune demon dwarf elf fairy fairy queen fay gnome gremlin hob hobgoblin imp kobold leprechaun nix nixie ouphe peri pixie pooka puca pwca sprite sylph sylphid