The word legitimatised 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™ Plays In The Letters
Seven Letter Word Alert: (69 words)
aediles, aiglets, dailies, deities, delates, delimes, delimit, deltate, demates, deslime, details, dieties, dietist, digital, dilates, ditties, eaglets, edgiest, elegist, elegits, elitism, elitist, emailed, emitted, galette, gametes, gamiest, gelated, gelates, gestalt, gestate, gleamed, ileitis, imitate, itemise, itemset, latites, legates, liaised, ligated, ligates, limeade, limited, mediate, metaled, mettled, mettles, midgets, mildest, mileage, militia, misdate, misdeal, misdial, misedit, mislaid, mislead, mitiest, settled, sidelit, sigmate, slatted, slitted, smelted, steamed, stilted, stimied, teatime, tidiest