The word anachronistic 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 anachronistic
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Seven Letter Word Alert: (53 words)
actinic, actions, anarchs, anchors, anionic, anoints, archaic, archons, arctans, arctics, artisan, atonias, atonics, cancans, canonic, cantons, cantors, cartons, cations, chanson, chaotic, chariot, chronic, citrons, coarcts, cochair, contain, cratons, critics, haricot, iconist, incants, incisor, introns, ischiac, nations, niacins, nicosia, nonarts, octarch, ostrich, rainhat, rations, rhotics, satanic, satiric, sciatic, scoriac, scratch, stannic, tarnish, tinhorn, tsarina