The word authorizers 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: 23
Highest Scoring Words With Friends™ Play In The Letters authorizers
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Seven Letter Word Alert: (34 words)
arouser, artsier, authors, azotise, azurite, earshot, hastier, haziest, hirsute, hoarier, hoarser, horsier, hurries, hurters, outhire, outsize, reroast, retours, rhetors, rioters, roaster, roister, routers, rustier, shorter, shouter, stourie, tarries, tourers, trasher, trouser, urethra, urostea, zithers