The word phosphoprotein 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: 24
Highest Scoring Words With Friends™ Plays In The Letters phosphoprotein
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Seven Letter Word Alert: (68 words)
erosion, heroins, hippest, histone, hoppers, hornets, inshore, iphones, isotope, nippers, norites, onshore, oophore, oospore, operons, opposer, options, orients, phisher, phonier, phonies, photons, pointer, poopers, poorest, poppers, poppies, portion, postern, pothers, potions, potpies, pronest, prophet, propine, propose, protein, protons, pterins, repoint, reshoot, ripstop, ropiest, rosehip, shipper, shooter, shopper, shorten, snipper, snippet, snooper, soother, sootier, soppier, sporont, stonier, stooper, stopper, strophe, thiones, thrones, tippers, toonies, toppers, toprope, topspin, torsion, triones