The word mucilaginous 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: 24
Highest Scoring Words With Friends™ Plays In The Letters mucilaginous
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Seven Letter Word Alert: (46 words)
agnosic, agonism, aisling, alginic, alumnus, amusing, calming, causing, cingula, closing, coaling, coiling, columns, comings, gliomas, glucans, gluonic, iconism, lacings, liaison, lionism, lousing, mailing, maligns, masonic, mauling, miscoin, monilia, moulins, mousing, mucosal, musical, nicosia, oilcans, osculum, sailing, saucing, scaling, silicon, slicing, sliming, smiling, soiling, solanum, unclogs, uncoils