The word photosensitize 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: 29
Highest Scoring Words With Friends™ Play In The Letters photosensitize
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Seven Letter Word Alert: (75 words)
epithet, epizoon, heptose, hessite, hipness, histone, hotness, hotpots, hotspot, inosite, insteps, ionises, ionizes, iotizes, iphones, isospin, isotope, nosiest, notists, onestep, ooziest, openest, options, osteons, ozonise, penises, pentose, peonies, petites, pettish, phonies, photons, pieties, pietist, pistons, poesies, poetess, poetise, poetize, poisons, poteens, potheen, potions, potshot, potties, seitens, septets, sestine, shitpot, siphons, snoozes, soonest, soothes, sphenes, spinets, spinose, stenose, stepson, stetson, stipite, stonish, tensest, theists, thiones, tiepins, tiniest, tinpots, tiptoes, toonies, tootsie, tosspot, zeniths, zionist, zipties, zoisite