The really sick part about word games is that you have to be good at math and have a large vocabulary to win most of them. And just for the record, sesquipedalophobia will NOT fit on the Scrabble board. You can use two triple-word-score tiles to boost your score x9, however.
Basically, you play or find words to score points. Word games are without question the geekiest possible way to spend an afternoon, but soooo worth it. Not only do they allow you to parade your knowledge without having to brag outright, they prepare you for other geeky pursuits like solving crossword puzzles and talking to cute girls at the library.
We carry the staples (Scrabble and Boggle), as well as more recent titles. Quiddler, for instance, challenges players to create words with cards they're dealt. Bananagrams is basically speed-Scrabble. PDQ is a fast-moving game for large groups: 3 letter-cards are placed on the table and players have to create a word with those letters in that order. Whoever yells their words first claims the cards—the player with the most cards wins.
Bull's Eye is our newest and most flexible word game. People who say they don't like word games like this one, though purists may find it too chaotic or not word-y enough. Hit or Miss is a very different style word game where each player writes as many words as possible in a given category, hoping to score for common and unique words alike.
P.S. Word games are supposedly only fun if you know how to spell, but Okie Scrabble maintains its appeal no matter what those snobs on NPR say.