The word obstructive 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 obstructive
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Seven Letter Word Alert: (42 words)
becrust, bescour, biotest, bitters, bousier, brucite, bustier, butters, butties, cotters, coverts, cursive, cutover, cutters, erotics, evictor, obscure, obtuser, obverts, outbets, overbit, overcut, oversit, revuist, scouter, sorbite, stourie, stouter, strobic, subvert, subvote, tourist, touters, tribute, tricots, trisect, trivets, turbots, vectors, victors, virtues, voicers