The word proteinase 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: 14
Highest Scoring Words With Friends™ Play In The Letters proteinase
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Seven Letter Word Alert: (81 words)
aeriest, antsier, arenite, atoners, earnest, eastern, entraps, entries, erotise, estrone, etaerio, inepter, nastier, nearest, norites, onestep, openers, openest, operant, operate, opiates, orients, otarine, painter, panters, panties, parents, parties, pastier, patines, patrons, peatier, pentose, peonies, persona, pertain, pioneer, pirates, poetise, pointer, postern, poteens, prenote, present, pretans, pronate, pronest, protean, protein, pterins, rations, reopens, repaint, repaste, repeats, repents, repines, repoint, respite, restain, retains, retapes, retinas, ropiest, roseate, seaport, senator, seriate, serpent, soapier, stainer, sterane, stonier, terpine, trainee, traipse, treason, trepans, triaene, trienes, triones