I occasionally like to invent classroom games which will enhance or spice up the learning quotient among my students. The lastest one is Zingo! (I originally called it "Ding!" but the students decided "Zingo!" would be better.)
The game goes like this: I to slip one of our vocabulary words past them by using it nonchalantly in casual classroom conversation. If they take note of that word, they are to say "Zingo!" and they get a point on a chart I made -- two points if they can define the word.
A second aspect of this game occurs when a student can use the word in classroom discussions -- for which they will get two points.
I've also used other standard word games to help students learn that words can be fascinating. A number of these games can be found online such as classic word jumbles and Boggle. You might have other favorites such as Scrabble or crossword puzzles. Others are more board-like games such as Balderdash.
Also, check out Wordnik.