The word retractable 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: 18
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (30 words)
abettal, abetter, abreact, acerate, acetate, actable, alerter, battler, bleater, cabaret, caterer, cerebra, clatter, clearer, eatable, lactate, ratrace, rattler, realter, rebater, rebrace, recrate, relater, retrace, retract, retreat, teacart, terrace, treacle, treater