The word seismographs 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 seismographs
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Seven Letter Word Alert: (66 words)
amorphs, asepsis, aspires, egoisms, epigram, gashers, gaspers, gaspier, gassers, gassier, geishas, geomaps, gophers, gossips, grasses, grosses, hampers, harpies, heroism, hissers, hoagies, homages, hosiers, imagers, imagoes, impasse, imposer, imposes, impress, isogram, isomers, magpies, marshes, mashers, messiah, mirages, mishaps, mishear, mispage, mossier, ogreish, paresis, passers, phrases, praises, premiss, primase, promise, raspish, reshims, reships, rosehip, sassier, seahogs, seraphs, shapers, sharpie, sherpas, shrimps, sighers, simpers, smasher, smashes, soapers, soapier, spireas