The word opportunistic 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™ Plays In The Letters opportunistic
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Seven Letter Word Alert: (53 words)
citrons, consort, contort, contour, copious, copouts, cottons, coupons, crouton, iconist, incisor, incrust, intorts, intrust, intuits, nitrous, octopus, options, outcrop, outpost, outspin, popcorn, porotic, portico, portion, potions, prootic, protist, protons, psionic, riotous, ripstop, risotto, scorpio, spinout, sporont, suction, support, tinpots, tiptops, topspin, topspun, torsion, tourist, tricots, tropics, tropist, tuition, turnips, uncoops, unstoic, unstrip, uproots