The word ingrates is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 11
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (28 words)
aigrets, antsier, argents, erasing, gainers, gaiters, garnets, gastrin, granite, ingrate, nastier, ratings, regains, restain, resting, retains, retinas, searing, seating, stagier, stainer, staring, stinger, strange, tangier, tearing, teasing, triages