The word obstructionists 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: 23
Highest Scoring Words With Friends™ Play In The Letters obstructionists
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Seven Letter Word Alert: (54 words)
biotics, biotins, biscuit, bistros, bitcoin, bosonic, broncos, buttons, citrons, cobnuts, consist, consort, contort, contour, cottons, cousins, crouton, cubists, iconist, incisor, incrust, insists, intorts, intrust, intuits, niobous, nitrous, notists, oboists, oncosis, outsits, outtrot, riotous, risotto, robotic, rubicon, rustics, scissor, strobic, subsist, subsort, suction, suitors, titbits, tocsins, torsion, tourist, tricots, tuition, turbots, unboots, uncross, unsorts, unstoic