The word untraceable 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: 20
Highest Scoring Words With Friends™ Plays In The Letters untraceable
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Seven Letter Word Alert: (48 words)
abluent, abreact, acerate, actable, arcuate, balance, banaler, bleater, blunter, cabaret, canulae, canular, carbeen, carbene, centaur, central, cleaner, crubeen, cuneate, curable, eatable, enabler, enteral, eternal, lacunae, lectern, lecture, natural, nebulae, nebular, neutral, nuclear, reblent, reclean, reenact, tableau, tabular, tenable, treacle, truncal, tunable, unabate, unalert, unalter, unbrace, unclear, uncrate, unerect