The word houselights 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: 19
Highest Scoring Words With Friends™ Play In The Letters houselights
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Seven Letter Word Alert: (30 words)
egoists, eighths, elogist, glioses, gluiest, gothish, gutless, heights, highest, hogties, holiest, hostels, hostile, hustles, isohels, lotuses, loutish, lushest, outlies, sleighs, sleight, sleuths, slights, sloughs, solutes, stogies, toughie, tousles, tugless, ugliest