The word talaq was decisive in ensuring that Craig Beevers was crowned World Scrabble Champion recently. It scored 42 points. The OED's entry is spelled talak, with talaq given as an alternative. The OED definition is: 'In Muslim law: (a method of) divorce by the husband's mere verbal repudiation of his wife in a set form of words'.
Other words on the final Scrabble board, with OED definitions given, included:
umu: A Maori earth-oven in which food is placed on heated stones
gleet: A morbid discharge from the urethra
barfs: An attack of vomiting
plus the more common met, dense, ow and jar.
For more winning words see this article.