The word procaryotes 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: 19
Highest Scoring Words With Friends™ Play In The Letters procaryotes
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Seven Letter Word Alert: (60 words)
apocyte, captors, carpers, carpets, carport, carrots, carroty, carters, coarser, coaster, corpora, cotypes, coyotes, craters, creator, oocytes, orators, oratory, parrots, poorest, porters, portray, praetor, praters, prayers, precast, precoat, presort, proctor, prorate, raptors, reactor, recoats, rectors, rectory, reports, reprays, reroast, reroots, respray, restrap, retraps, roaster, rooster, rooters, scooper, scooter, scraper, seaport, sorcery, spectra, sprayer, stooper, strayer, toecaps, torpors, tracers, tracery, trocars, trooper