The word enthusiastic 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: 19
Highest Scoring Words With Friends™ Play In The Letters enthusiastic
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Seven Letter Word Alert: (55 words)
achiest, acutest, acutish, aitches, ascents, ascites, ashiest, atheist, attunes, aunties, autists, caseins, chaises, chasten, chaunts, cuisine, etchant, ethnics, hastens, ichnite, iciness, incests, incises, incites, insects, instate, intuits, nictate, nutcase, sachets, sanctus, scathes, secants, seitans, sestina, shutins, sinuate, situate, stances, statice, statics, statins, statues, staunch, sunhats, sustain, tautens, tetanic, tetanus, theists, tiniest, titanic, unities, unseats, unteach