The word penuriousness 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: 20
Highest Scoring Words With Friends™ Play In The Letters penuriousness
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Seven Letter Word Alert: (58 words)
ensures, espouse, insures, issuers, neurons, nonuser, oneness, openers, osseins, penises, penners, pennies, pension, peonies, persons, peruses, pinenes, pioneer, poesies, poseurs, presses, prisons, punners, punnier, purines, pursues, pussier, pussies, reissue, reopens, repines, reposes, respins, reunion, ruinous, seniors, sensors, serious, session, sinners, sinuous, sinuses, snipers, soirees, soupier, spinner, spinons, spinose, spinous, spouses, sunnier, sunnies, sunrise, suspire, unrisen, uprisen, uprises, uprouse