The word intermingled 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: 21
Highest Scoring Words With Friends™ Play In The Letters intermingled
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Seven Letter Word Alert: (75 words)
deeming, deleing, delimit, demerit, dentine, denting, dietine, dieting, dimeter, dingier, dinting, editing, eleidin, eliding, eminent, engined, gentile, gentled, gentler, glinted, gremlin, grinned, ignited, igniter, inditer, integer, interim, leering, lending, lenient, lenited, lignite, limited, limiter, limning, linemen, lintier, meeting, melding, melting, mending, merited, midline, minding, mingled, mingler, mintier, minting, mitered, needing, nitrene, nitride, redline, reeling, regimen, reigned, reining, relined, remined, rending, renting, retiled, retimed, ringlet, ringmen, teeming, tending, tendril, termini, tiering, timider, tingled, tingler, tinnier, treeing