The word signalers 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: 13
Highest Scoring Words With Friends™ Play In The Letters signalers
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Seven Letter Word Alert: (32 words)
airless, aligner, anglers, erasing, gainers, gassier, genials, girnels, ingress, largess, learing, leasing, ligases, lingers, nailers, realign, regains, renails, resails, resigns, sailers, salines, sealing, searing, serials, signals, signers, silanes, singers, singles, slinger, sringas