The word invigilations 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: 22
Highest Scoring Words With Friends™ Play In The Letters invigilations
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Seven Letter Word Alert: (36 words)
agonist, aisling, anglist, anoints, antlion, atoning, initial, intagli, lasting, liaison, lignins, linings, listing, livings, loaning, nailing, nations, oligist, sailing, salting, salving, silting, slating, slaving, soiling, solving, staving, stiving, stoning, tailing, tilings, toiling, vialing, violing, violins, violist