The word arthrospores 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: 17
Highest Scoring Words With Friends™ Play In The Letters arthrospores
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Seven Letter Word Alert: (71 words)
arrests, earshot, hapters, harpers, hoarser, horrors, orators, parrots, parsers, pasters, pastors, phraser, phrases, poorest, poroses, porters, posters, pothers, praetor, praters, presort, prorate, raptors, rashers, rashest, raspers, rasters, repasts, reports, reposts, reroast, reroots, reshoot, resorps, resorts, respots, restrap, retraps, rhetors, roarers, roaster, rooster, rooters, rosters, seaport, seraphs, shapers, sharers, sharper, sherpas, shooter, shorter, soapers, soarers, soother, soothes, sophtas, sorters, sparers, sparest, sparser, starers, stooper, strophe, teashop, tephras, terrors, torpors, trasher, trashes, trooper