The word preventions 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: 20
Highest Scoring Words With Friends™ Play In The Letters preventions
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Seven Letter Word Alert: (73 words)
entries, enviers, environ, erosive, erotise, estrone, inepter, intense, interns, intoner, intones, introns, invents, inverse, inverts, nitrene, norites, onestep, openers, openest, orients, overset, oversit, overtip, penners, pennies, pension, pensive, pentose, peonies, pinenes, pioneer, pivoter, poetise, pointer, pontine, postern, poteens, prenote, present, prevent, pronest, protein, pterins, rennets, reopens, repents, repines, repivot, repoint, respite, restive, revotes, ropiest, serpent, sievert, spinner, spinnet, stonier, striven, tenners, tenpins, tension, terpine, tinners, trienes, triones, venison, versine, version, vetoers, vintner, voteens