The word authoritatively 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: 25
Highest Scoring Words With Friends™ Play In The Letters authoritatively
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Seven Letter Word Alert: (61 words)
airhole, alveary, arylate, attrite, aureola, aviator, earthly, heavily, hyalite, ilvaite, irately, lathery, layover, loather, lottery, luthier, olivary, outhire, outlier, outlive, outrate, outrave, ovately, overlay, overlit, overtly, ovulate, rathole, rattail, ravioli, reality, reavail, retotal, rivulet, tartlet, tattier, tattler, tearily, tertial, thorite, throaty, titrate, titular, toluate, travail, trivial, tutorly, uralite, urolith, utility, utterly, valuate, variate, variety, variola, vaulter, velaria, violate, virtual, vitiate, vitriol