The word attitudinises 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: 16
Highest Scoring Words With Friends™ Play In The Letters attitudinises
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Seven Letter Word Alert: (51 words)
attends, attests, attuned, attunes, aunties, autists, daisies, dentist, destain, detains, dietist, dissent, distant, ditties, dunites, indites, insides, instate, instead, intuits, nudists, sainted, seitans, sestina, sinuate, situate, snidest, stained, statins, statist, statued, statues, statute, stinted, student, studies, stunted, sudates, sundaes, sustain, tainted, taunted, tautens, tautest, tetanus, tidiest, tiniest, tissued, unities, unsated, unseats