The word millionaires 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: 18
Highest Scoring Words With Friends™ Plays In The Letters millionaires
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Seven Letter Word Alert: (49 words)
aileron, airline, almoner, animose, anomers, elision, enamors, enrolls, ioniser, ironies, liaison, lionise, lionism, loamier, loaners, mailers, manlier, marines, marlins, millers, million, mineral, moaners, monilia, moraine, morales, nailers, noisier, normals, oarsmen, orleans, rallies, realism, reloans, remails, remains, renails, romaine, sealion, seminal, seminar, sillier, similar, siriema, sirloin, sirname, slimier, smaller, smilier