The word overactivities 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 overactivities
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Seven Letter Word Alert: (86 words)
acerose, activer, actives, aeriest, airiest, artiest, attires, avivore, cattier, cavorts, cerates, citator, citrate, coaster, coesite, costate, coterie, cotters, coverts, coveter, creates, cristae, erosive, erotica, erotics, erotise, etaerio, evasive, evictor, evitate, evocate, iratest, irisate, iterate, ivories, ivorist, octaves, ovaries, overact, overate, overeat, oversat, oversea, overset, oversit, raciest, recites, recoats, restate, restive, retaste, retoast, revisit, revives, revoice, revotes, ricotta, roseate, rosette, rotates, satiric, savvier, scatter, scoriae, seriate, service, sievert, statice, stative, stivier, striate, tastier, testier, toaster, tricots, trisect, trivets, varices, vectors, veritas, vetoers, victors, viscera, visitor, vitiate, voicers