The word bathyspheres 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: 24
Highest Scoring Words With Friends™ Play In The Letters bathyspheres
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Seven Letter Word Alert: (61 words)
asperse, bashers, basters, bathers, beaters, berates, betrays, breasts, breathe, breaths, breathy, bypaths, essayer, eyebars, eyebath, hapters, heapers, hearses, hearths, heaters, heather, pasters, pessary, pesters, phrases, preheat, presets, rashest, rebases, rebates, rebathe, rebaths, reheaps, reheats, repaste, repasts, repeats, reseats, reshape, resteps, retapes, retypes, seaters, serapes, seraphs, shapers, sheathe, sheaths, sherbet, sherpas, shyster, sparest, spheres, spryest, stayers, teasers, tephras, therapy, thereby, trashes, typebar