The word prohibitionists 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: 24
Highest Scoring Words With Friends™ Play In The Letters prohibitionists
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Seven Letter Word Alert: (35 words)
biotins, bishops, bistros, boorish, hotpots, hotspot, inhibit, intorts, isospin, notists, oboists, options, photons, pistons, poisons, porosis, portion, potions, potshot, prisons, protist, protons, risotto, shitpot, siphons, spirits, sponsor, sporont, sprints, stonish, thirsts, tinpots, torsion, tosspot, tropist