The word prospectors 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 prospectors
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Seven Letter Word Alert: (42 words)
coppers, corpses, corsets, cropper, crosser, escorts, opposer, opposes, oppress, poopers, poorest, poroses, porters, posters, presort, process, proctor, propose, prosper, recross, rectors, reports, reposts, reroots, resorps, resorts, respots, rooster, rooters, rosters, scooper, scooter, scorers, sectors, soppers, sorters, stooper, stopper, toppers, toprope, torpors, trooper