The word trespasser 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: 13
Highest Scoring Words With Friends™ Play In The Letters trespasser
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Seven Letter Word Alert: (41 words)
arrests, asepses, asperse, asserts, erasers, parsers, passers, pasters, pesters, praters, presets, presser, presses, raspers, rasters, reapers, reparse, repaste, repasts, repeats, repress, rerapes, reseats, resteps, resters, restrap, retapes, retears, retraps, seaters, serapes, serrate, sparers, sparest, sparser, spearer, starers, taperer, tearers, teasers, tresses