The word quarterlight 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: 27
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (27 words)
alright, attirer, glitter, gritter, laugher, lighter, luthier, quarrel, quarter, quartet, quilter, quitter, rattier, rattler, regular, relight, retrial, righter, ruttier, tequila, tertial, tighter, titular, trailer, turtler, uralite, urethra