The word strikingness 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™ Play In The Letters strikingness
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Seven Letter Word Alert: (47 words)
ensigns, igniter, ignites, ingests, ingress, inkiest, inserts, insists, interns, kerning, kinesin, kinesis, kissers, kissing, nesting, reining, reknits, renting, resigns, resists, resting, rinking, rinsing, risings, risking, sensing, signers, signets, singers, sinkers, sinking, sinners, sinters, siskins, sissier, sisters, skinner, stinger, stinker, strikes, strings, tensing, tiering, tigress, tinkers, tinners, tinnier