The word pluckiness 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 pluckiness
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Seven Letter Word Alert: (32 words)
celsius, cupless, cuplike, inkless, kinless, lineups, linkups, lupines, nickels, nickles, pencils, pickles, pinless, punless, puslike, sickens, sickles, silkens, sluices, spelunk, spicule, spinels, spinule, splenic, splices, splines, suckles, sulkies, sunlike, unclips, unlikes, uplinks