The word miniaturises 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: 17
Highest Scoring Words With Friends™ Plays In The Letters miniaturises
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Seven Letter Word Alert: (90 words)
airiest, airtime, animist, antsier, arenium, artsmen, assumer, atriums, aunties, estrums, inertia, inmates, inseams, inserts, instars, insures, interim, irisate, manures, marines, martens, martini, martins, masseur, masters, matures, minaret, miniate, minters, mintier, minuets, minuses, minuter, minutes, misseat, missuit, misters, mistier, mistune, misturn, misuser, munites, muriate, musters, mustier, nastier, natures, nutsier, raiment, raisins, remains, remints, restain, retains, retinas, runtime, satires, saunter, seitans, seminar, sestina, simians, sinters, sinuate, siriema, sirname, smarten, smartie, smiters, stainer, stamens, sternum, stimies, strains, streams, suiters, sunrise, sunstar, surmise, surname, sustain, termini, tsarism, tsunami, uniters, unities, unmates, unrests, unseats, urinate