The word photospheres 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™ Plays In The Letters photospheres
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Seven Letter Word Alert: (36 words)
heptose, heteros, hoppers, opposer, opposes, oppress, pesters, poetess, poopers, poorest, poroses, posters, pothers, presets, prophet, propose, reposes, reposts, reshoes, reshoot, respots, resteps, shooter, shopper, soother, soothes, soppers, spheres, stepper, steppes, stereos, stooper, stopper, strophe, toppers, toprope