We house-rule this. When playing Scrabble in my group of friends, we've added a rule that when a word is challenged, not only will the challenger look the word

We house-rule this. When playing Scrabble in my group of friends, we've added a rule that when a word is challenged, not only will the challenger look the word up in a dictionary, but the one who was challenged must correctly use the word in a sentence. It's more fun that way (for us), and it gives us all an incentive to go learn both the spelling and meaning of obscure words.