The word greenmails 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (70 words)
aligner, anglers, enamels, enigmas, enlarge, enrages, erasing, gainers, geminal, general, genials, germane, girnels, gleaner, gmelina, greisen, gremlin, imagers, leaners, learing, leasing, leering, lineage, lingers, mailers, maligns, mangers, mangier, mangler, mangles, manlier, margins, marines, marlins, mealier, meanies, melange, menages, mileage, mineral, mingler, mingles, mirages, nailers, realign, realise, realism, reaming, reeling, regains, regimen, regimes, reimage, relines, remails, remains, remiges, remines, renails, renames, sealing, seamier, seaming, searing, seeming, seminal, seminar, seriema, sirname, slinger