The word insecticide 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™ Plays In The Letters insecticide
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Seven Letter Word Alert: (21 words)
deceits, deictic, deistic, deities, descent, destine, diciest, dietics, dieties, dietine, eidetic, enticed, entices, incised, incited, incites, indices, indicts, indites, scented, science