The word authentically 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 authentically
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Seven Letter Word Alert: (47 words)
aclinal, actuate, acutely, acylate, alethic, alicant, analyte, anthill, attache, canulae, cattail, cattily, cauline, chantey, chateau, chattel, chutney, cleanly, cutline, cyanate, cyanite, cyathia, etchant, ethical, helical, hellcat, hyaline, hyalite, lactate, lacteal, lacunae, latency, lattice, lithely, lunatic, nattily, nautica, nictate, nullity, tacitly, tactile, tactual, tenthly, tetanic, unlatch, unteach, yachtie