The word repentances 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: 19
Highest Scoring Words With Friends™ Plays In The Letters repentances
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Seven Letter Word Alert: (64 words)
canteen, canters, careens, carpets, centers, centres, cerates, creates, earnest, eastern, ensnare, entraps, entrees, escapee, escaper, nascent, nearest, neatens, nectars, panters, parents, pectens, penance, pencase, penners, pentane, pentene, percent, prances, precast, precent, present, pretans, preteen, recanes, recants, reenact, rennets, repaces, repaste, repeats, repents, respace, respect, retapes, scanner, scanter, scenter, scepter, sceptre, secrete, serpent, spanner, specter, spectra, spectre, steepen, steeper, sterane, tanners, tenners, terpene, trances, trepans