The word malignities 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™ Play In The Letters malignities
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Seven Letter Word Alert: (68 words)
aiglets, ailment, aisling, aliment, anglist, animist, elastin, elating, elitism, enigmas, entails, gamiest, gelatin, geminal, genials, genital, glisten, gmelina, ignites, ileitis, imagine, initial, inmates, intagli, laments, lasting, leasing, ligates, lignite, listing, magnets, mailing, maligns, malting, mangles, mantels, mantles, matings, melting, militia, mingles, miniate, mintage, misting, nailset, netmail, sailing, salient, salting, sealing, seaming, seating, seminal, sigmate, silting, singlet, slating, sliming, smiling, smiting, tagline, tailing, tangles, teaming, teasing, tilings, timings, tingles