The word heliographed 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 heliographed
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Seven Letter Word Alert: (36 words)
aerogel, airhole, deplore, digraph, dipolar, geoidal, gloried, godlier, graphed, hagride, hagrode, haploid, harelip, headier, healder, helipad, lagered, leopard, lipread, paroled, pearled, peregal, pergola, periled, pleader, pledger, predeal, predial, preload, redpole, relodge, reoiled, repaged, repiled, replead, replied