The word prostitution 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: 17
Highest Scoring Words With Friends™ Play In The Letters prostitution
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Seven Letter Word Alert: (24 words)
intorts, intrust, intuits, nitrous, options, outpost, outspin, outtrot, portion, potions, protist, protons, riotous, risotto, spinout, sporont, tinpots, torsion, tourist, tropist, tuition, turnips, unstrip, uproots