The word chastisement 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: 21
Highest Scoring Words With Friends™ Play In The Letters chastisement
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Seven Letter Word Alert: (82 words)
achenes, achiest, aitches, amnesic, anthems, ascents, ascites, ashiest, atheise, atheism, atheist, caseins, catmint, cements, chaises, chasten, chemist, cinemas, easiest, emetics, encases, entices, estates, etchant, ethanes, ethnics, haemins, hastens, hessite, icemans, icemass, incests, inmates, inseams, insects, instate, itemset, machete, machine, matches, matinee, meanest, meanies, menaces, messiah, methane, miscast, misseat, mittens, neatest, nematic, nemesis, nictate, sachets, sateens, scathes, schemas, schemes, seances, secants, seitans, seitens, senates, sensate, sestina, sestine, siamese, siemens, smitten, stamens, stances, statice, statics, statins, statism, teaches, teatime, techies, tensest, tetanic, theisms, theists