10 letters · 13 points in Scrabble
noun an ardent and enthusiastic supporter of some person or activity
noun a person having a strong liking for something
originFrom Ancient Greek ἐνθουσιαστής (enthousiastḗs, “an enthusiast, a zealot”), from ἐνθουσιάζειν (enthousiázein, “(intransitive) be inspired or possessed by a god, be rapt, be in ecstasy, (transitive) inspire”): see enthusiasm.
Etymology from Wiktionary, CC BY-SA 3.0