The word proprioceptors is playable in Words With Friends™, but 1 blank substituting for the letter 'p' is 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: 22
Highest Scoring Words With Friends™ Plays In The Letters proprioceptors
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Seven Letter Word Alert: (56 words)
cooties, copiers, coppers, crisper, cropper, crosier, erotics, isotope, ooscope, oospore, opposer, poetics, poopers, poorest, poppers, poppies, porotic, porters, portico, potpies, presort, pricers, proctor, prootic, propose, prosper, rectors, reports, reroots, rioters, rippers, ripstop, roister, rooster, rooters, ropiest, scooper, scooter, scorpio, sootier, soppier, sorrier, stirrer, stooper, stopper, striper, terroir, terrors, tippers, toppers, toprope, torpors, triceps, tripper, trooper, tropics