The word stoichiometric 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: 25
Highest Scoring Words With Friends™ Play In The Letters stoichiometric
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Seven Letter Word Alert: (63 words)
chemics, chemist, choicer, choices, chooser, chromes, chromic, cithers, coheirs, cohorts, cometic, cooties, cotters, critics, crochet, erotics, hermits, heroics, heroism, hitters, homiest, icteric, itchier, meiotic, metrics, metrist, miscite, mistier, mitiest, mitotic, moister, moocher, mooches, moorish, mortise, mothers, mottoes, omitter, osmotic, ostrich, reshoot, rhotics, richest, risotto, scooter, scrooch, shooter, smother, somitic, soother, sootier, stretch, thermic, thermos, thorite, tictocs, tithers, titmice, tooters, tootsie, torches, tricots, trisect