The word monopolisation 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: 23
Highest Scoring Words With Friends™ Play In The Letters monopolisation
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Seven Letter Word Alert: (48 words)
amnions, animist, anoints, antlion, impasto, implant, lampoon, liaison, lionism, lipomas, lotions, mansion, minions, misplan, monilia, monsoon, moonlit, motions, nations, nominal, nonmail, nonslip, nonstop, notions, ooplasm, ooplast, opinion, optimal, options, palmist, pianist, pinions, pinitol, pintail, plasmin, plasmon, platoon, plosion, pontoon, postman, potions, saponin, tailpin, tampons, timpani, toolman, topsail, topsoil