Yes, cult is a Scrabble word!

Noun

1. Followers of an exclusive system of religious beliefs and practices

2. An interest followed with exaggerated zeal

3. Followers of an unorthodox, extremist, or false religion or sect who often live outside of conventional society under the direction of a charismatic leader

4. A religion or sect that is generally considered to be unorthodox, extremist, or false

5. A system of religious beliefs and rituals