The word heliograms 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: 18
Highest Scoring Words With Friends™ Play In The Letters heliograms
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Seven Letter Word Alert: (23 words)
airhole, armhole, gaolers, gliomas, glories, goalies, heroism, hoagies, homages, imagers, imagoes, isogram, largish, loamier, mailers, mirages, mishear, morales, ogreish, realism, remails, semilog, shalier