The word photoelectron 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 photoelectron
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Seven Letter Word Alert: (32 words)
chortle, clotter, contort, control, cornett, coronet, echelon, elector, hencoop, honoree, lectern, notcher, oophore, percent, plotter, portent, portlet, potheen, pothole, precent, precool, prelect, prenote, protect, reclone, rootlet, thereon, thereto, tootler, tornote, treetop, trochee