The word invigilators 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 invigilators
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Seven Letter Word Alert: (57 words)
agonist, airings, aisling, anglist, arising, gastrin, ignitor, initial, intagli, invitro, ivorist, lairing, lasting, liaison, listing, livings, nostril, oligist, orating, origins, railing, raising, ratings, rations, ravings, ravioli, rioting, roiling, sailing, salting, salving, signora, silting, sirloin, slating, slaving, soaring, soiling, solving, sorting, staring, staving, stiving, storing, tailing, tailors, tilings, toiling, trivial, vialing, violing, violins, violist, virgins, virions, visitor, vitriol