The word bathysphere 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: 23
Highest Scoring Words With Friends™ Play In The Letters bathysphere
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Seven Letter Word Alert: (32 words)
bathers, beaters, berates, betrays, breathe, breaths, breathy, bypaths, eyebars, eyebath, hapters, heapers, hearths, heaters, heather, preheat, rebates, rebathe, rebaths, reheaps, reheats, repaste, repeats, reshape, retapes, retypes, sheathe, sherbet, tephras, therapy, thereby, typebar