First, make sure you have the latest version of the game (check in the App Store or Google Play).
Double click the home button on your Apple device.
Find the Words With Friends icon in the bottom bar.
Tap and hold the icon until they all begin to shake.
Tap the minus symbol on it to kill the app.
Single click the home button.
Open Words With Friends.
Open your Android device's Settings.
Tap on "Applications."
Tap on "Manage Applications."
Select "Words With Friends"
Push the "Force Stop" button.
Return to your home page and open Words With Friends.