The word supermarket 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: 22
Highest Scoring Words With Friends™ Plays In The Letters supermarket
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Seven Letter Word Alert: (74 words)
amperes, amputee, armrest, austere, epurate, erasure, erratum, euaster, eurekas, makeups, markers, markets, markups, maturer, matures, measure, meerkat, muskrat, pasture, permute, praters, prearms, premake, presume, preterm, rapture, reakers, reamers, reapers, remaker, remakes, remarks, remates, reparks, reparse, repaste, repeats, reperks, rerapes, respeak, restake, restamp, restrap, restump, resumer, retaker, retakes, retapes, reteams, retears, retraps, serrate, smarter, smearer, sparker, speaker, spearer, spurter, stamper, starker, steamer, stumper, supreme, tampers, taperer, tearers, tempera, tempers, tempura, tramper, uprates, uprears, uptakes, ureters