The word purposelessness is playable in Scrabble®, but 1 blank substituting for the letter 's' is required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Scrabble® Letter Score: 18
Highest Scoring Scrabble® Plays In The Letters purposelessness
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Seven Letter Word Alert: (50 words)
elopers, ensouls, ensures, espouse, leprous, lessees, lessens, lessons, lessors, loppers, openers, oppress, peelers, peepers, peoples, pepless, persons, peruses, plusses, poseurs, possess, presses, pressup, propels, propene, pulpers, pulsers, punless, purples, purpose, reopens, repeels, reposes, repulse, resoles, sensors, sleeper, slopers, sonless, soppers, spleens, sporule, spouses, sunless, suppers, suppler, suppose, unreels, upslope, useless