8 letters · 14 points in Scrabble
noun a female demon believed to have sexual intercourse with sleeping men
originAlteration in Middle English (based on incubus m) of Late Latin succuba (“strumpet, especially a mythological fiend in female form who has intercourse with men in their sleep”), from Latin succubo (“to lie under”), from sub- (“under”) + cubare (“to lie down”).
Etymology from Wiktionary, CC BY-SA 3.0