The word osteopathists 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: 18
Highest Scoring Words With Friends™ Play In The Letters osteopathists
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Seven Letter Word Alert: (30 words)
asepsis, ashiest, atheist, attests, hostess, hotpots, hotspot, hottest, isotope, opiates, pasties, patties, pettish, possets, potshot, potties, shitpot, siestas, soothes, sophtas, stashes, statist, taoists, tattoos, teapots, teashop, theists, tiptoes, tootsie, tosspot