The word maligners 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (43 words)
aligner, anglers, enigmas, erasing, gainers, geminal, genials, girnels, gmelina, gremlin, imagers, learing, leasing, lingers, mailers, maligns, mangers, mangier, mangler, mangles, manlier, margins, marines, marlins, mineral, mingler, mingles, mirages, nailers, realign, realism, reaming, regains, remails, remains, renails, sealing, seaming, searing, seminal, seminar, sirname, slinger