The word malignancies 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 malignancies
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Seven Letter Word Alert: (67 words)
aisling, alanine, alginic, amnesia, amnesic, anaemic, angelic, anginal, anginas, aniline, animals, anneals, asinine, calming, canines, ceasing, ceiling, cinemas, encalms, enigmas, galenas, geminal, genials, glances, gmelina, icemans, imagine, incline, inlines, lacings, lacinia, laicise, laminae, laminas, lancing, lasagne, leaning, leasing, lensing, lignins, limning, lineman, linings, magical, mailing, malaise, malices, maligns, manacle, manages, mangles, maniacs, meaning, melanin, menisci, mincing, mingles, nailing, niacins, sailing, scaling, sealing, seaming, seminal, slicing, sliming, smiling