The word plagiarisers 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™ Play In The Letters plagiarisers
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Seven Letter Word Alert: (47 words)
aerials, airgaps, airless, aliases, aspirer, aspires, gapless, gaspers, gaspier, gassier, gipsies, girlier, girlies, grasper, gripers, laagers, largess, liaises, ligases, lipases, lispers, palsies, paresis, parsers, passage, pissier, prairie, praiser, praises, raisers, raspers, raspier, realgar, regalia, regrasp, regrips, repairs, resails, sailers, sarapes, serials, sierras, sparers, sparser, spiraea, spirals, spireas