The word miniaturizes 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: 26
Highest Scoring Words With Friends™ Plays In The Letters miniaturizes
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Seven Letter Word Alert: (65 words)
airiest, airtime, animist, antsier, arenium, artsmen, atriums, aunties, azurine, azurite, inertia, inmates, interim, irisate, manures, marines, martens, martini, martins, matures, maziest, minaret, miniate, minters, mintier, minuets, minuter, minutes, mistier, mistune, misturn, munites, muriate, mustier, nastier, natures, nutsier, raiment, remains, remints, restain, retains, retinas, runtime, saunter, seminar, sinuate, siriema, sirname, smarten, smartie, stainer, sternum, surname, termini, tsunami, tzarism, uniters, unities, unitize, unmates, urazine, urinate, zaniest, zeatins