The word photoconductive 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: 33
Highest Scoring Words With Friends™ Play In The Letters photoconductive
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Seven Letter Word Alert: (44 words)
cinched, coconut, conceit, concept, conduce, conduct, conduit, convect, convict, coopted, couched, counted, dovecot, ectopic, eudicot, hencoop, hideout, indepth, nepotic, notched, noticed, octopod, oncotic, outdone, outvote, oviduct, photoed, pinched, pitched, pivoted, pointed, pooched, potiche, pouched, pounced, poutine, punched, puttied, tiptoed, toothed, touched, uncited, unhoped, vouched