The word cleistogamy 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (53 words)
acetyls, acolyte, aiglets, alecost, aloetic, atomics, atomise, cagiest, calmest, castile, catelog, celosia, climate, coalise, coalite, cotylae, cotyles, cystoma, cytomas, egotism, elastic, elogist, emacity, gametic, gamiest, gelatos, gliomas, glycose, goalies, imagoes, isolate, laciest, lactose, laytime, ligates, locates, malices, maltose, meatily, metical, moistly, motleys, myalgic, mycelia, mycetal, myeloic, myotics, semilog, sigmate, society, somatic, stagily, stoical