Crumple the papers up and have a snowball fight for a set amount of time. The third grade curriculum blog suggested setting a timer for 30 secs.
Once the fight is over everyone has to pick up one of the snowballs and find their partner. I.e. the students who find a word have to locate the definition and the students who find the definition have to find the word.
You can also prepare the words in advance if you want to review certain vocabulary words.
For more great vocabulary games and activities click on the links.