Here is a great time-filler that is educational and fun and can be done in the moment with little planning.
1. Think of 5 categories for words. Write them down the left side of your paper.
2. Write a word (preferably with no repeating letters) on the top of the page, each letter is a column
3. Add lines to make a chart.
4. Students come up with words that fit the category in the row and start with the letter in the column.
It is nice to do around themes (this one was around Valentines Day) but you can also do themes for subject areas or random words.
It's a fun, but educational time-filler you can do with little to no supplies.
Another added challenge is to give points to people who have words no one else has, this challenges them to come up with less common words and be creative.
Here is an example