The word prosthodontists 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™ Play In The Letters prosthodontists
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Seven Letter Word Alert: (37 words)
dishorn, disroot, distort, hotpots, hotrods, hotspot, indoors, intorts, isodont, isopods, notists, options, photons, pistons, poisons, porosis, portion, potions, potshot, prisons, protist, protons, risotto, shitpot, siphons, sponsor, sporont, sprints, stonish, thirsts, tinpots, toroids, torpids, torsion, tosspot, tripods, tropist