The word progymnosperms 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: 31
Highest Scoring Words With Friends™ Play In The Letters progymnosperms
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Seven Letter Word Alert: (49 words)
engross, eponyms, ergonym, geonyms, groomer, gropers, grosser, gyppers, meronym, mongers, mongery, monomer, moppers, mossery, myogens, noosers, oosperm, operons, opposer, opposes, oppress, orogens, orogeny, oronyms, ospreys, persons, pompoms, poopers, poroses, progeny, propmen, propose, propyne, prosper, pyrones, pyropes, regroom, resorps, rompers, roomers, sensory, sermons, snooper, snorers, sooners, soppers, sponger, sponges, sponsor