The word authenticating 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: 24
Highest Scoring Words With Friends™ Play In The Letters authenticating
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Seven Letter Word Alert: (44 words)
actuate, agatine, agitate, ancient, antigen, attache, canting, catenin, catting, chateau, cutting, enchain, enchant, etchant, etching, gentian, guanine, guttate, hatting, heating, hinting, hitting, hunting, hutting, ichnite, inching, itching, nautica, netting, nictate, nightie, nutting, tangent, tauting, tenting, tetanic, tighten, tinting, titanic, tithing, unchain, unhinge, uniting, unteach