The word interloping 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 interloping
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Seven Letter Word Alert: (35 words)
egotrip, eloping, igniter, ignitor, intoner, ironing, lignite, lintier, liriope, onliner, opening, opining, pelting, pingler, pinitol, pointer, politer, pontine, porting, proline, protein, reining, renting, repilot, repoint, retinol, ringlet, rioting, roiling, tiering, tingler, tinnier, toiling, topline, tripole