The word prickliness 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™ Plays In The Letters
Seven Letter Word Alert: (54 words)
clinker, crinkle, crispen, iciness, incises, inkless, inspire, irenics, kinesic, kinesis, kinless, lickers, linkers, lispers, nickels, nickles, pencils, pickers, pickier, pickler, pickles, pincers, pinkers, pinkier, pinkies, pinless, pissier, plinker, prickle, princes, reclips, relinks, respins, sericin, sickens, sickles, silkens, silkier, sinkers, sinlike, slicers, slicker, snicker, snipers, spicers, spicier, spikers, spikier, spinels, spinier, splenic, splicer, splices, splines