The word purposefulness 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: 27
Highest Scoring Words With Friends™ Play In The Letters purposefulness
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Seven Letter Word Alert: (68 words)
elopers, ensouls, ensures, espouse, flenser, flenses, flopper, flosses, forseen, fuelers, furless, fussers, leprous, lessens, lessons, lessors, loppers, lupuses, oneself, openers, oppress, ourself, peoples, pepless, perfuse, persons, peruses, plusses, poseurs, presses, pressup, profess, profuse, propels, propene, pulpers, pulsers, punless, purfles, purples, purpose, pursues, refuels, refuses, reopens, reposes, repulse, resoles, sensors, slopers, sonless, soppers, spleens, sporule, spouses, sulfone, sulfurs, sunless, suppers, suppler, suppose, surplus, unfurls, unreels, uprouse, upslope, urnfuls, useless