The word photocathodes 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™ Play In The Letters photocathodes
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Seven Letter Word Alert: (46 words)
cahoots, cathode, chatted, cheapos, coasted, codetta, coopted, costate, dashpot, hatched, hatches, hatchet, hatshop, hothead, hotpots, hotshot, hotspot, octopod, ooscope, ootheca, opcodes, patched, patches, photoed, poached, poaches, podcast, pooched, pooches, pothead, potshot, scathed, scatted, scooped, scooted, shotted, soothed, spatted, spotted, stooped, teapots, teashop, toasted, toecaps, toothed, topcoat