The word sandpapering 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: 23
Highest Scoring Words With Friends™ Play In The Letters sandpapering
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Seven Letter Word Alert: (76 words)
agendas, airgaps, anapsid, anginas, appears, appends, apprise, aspired, dangers, dappers, dapping, darning, deraign, despair, diapers, dinners, dippers, draping, earning, endings, engrasp, erasing, gainers, ganders, gappers, gardens, gaspier, grained, grandpa, grasped, grinned, gripped, innards, insaner, nappers, nappies, napping, nearing, nippers, panders, parades, parings, parsing, parsnip, pending, pigpens, pinesap, pingers, praised, prepaid, radians, rapping, rasping, reading, reaping, regains, rending, sandier, sanding, sangria, sappier, sapping, sardine, searing, sending, snapped, snapper, snaring, snipped, snipper, spading, spanned, spanner, sparing, spinner, spiraea