The word fingermarks 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: 24
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (52 words)
angrier, earring, enigmas, erasing, famines, farmers, farming, fearing, fingers, firearm, fireman, framers, framing, franker, fringer, fringes, gainers, garners, girners, grainer, imagers, makings, mangers, mangier, margins, mariner, marines, markers, marking, marries, marring, masking, mirages, ramekin, rangers, rangier, rankers, reaking, reaming, rearing, refrain, regains, remains, remarks, ringers, seaming, searing, seminar, sinkage, sirname, smirker, snakier