The word calumniations 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
Seven Letter Word Alert: (85 words)
actions, actuals, alicant, alumina, amnions, amounts, animals, animist, anionic, annuals, anoints, antlion, atomics, atonias, atonics, auction, calamus, cannoli, cannula, cantons, canulas, cations, caution, coalman, coastal, coatman, colitis, columns, consult, contain, cultism, iconism, iconist, incants, insulin, inulins, italics, lacinia, laminas, liaison, lionism, lunatic, maniacs, mansion, manuals, masonic, minions, miscoin, monilia, moulins, mucosal, musical, nations, nautica, niacins, nicosia, nominal, nonmail, nonsuit, oculist, oilcans, outmans, outsail, sanctum, satanic, scatoma, silicon, solanum, solicit, somatic, somitic, stamina, stannic, stannum, stimuli, stoical, suction, sultana, toucans, tsunami, unclots, uncoils, unction, unstain, unstoic