The word pentlandite 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: 18
Highest Scoring Words With Friends™ Play In The Letters pentlandite
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Seven Letter Word Alert: (29 words)
adenine, annelid, deltate, dentate, dentine, deplane, entitle, lenient, lenited, lineate, nettled, painted, palette, paneled, patient, patined, peltate, pendant, pendent, penlite, pentail, pentane, petaled, pinnate, plaited, planned, planted, pleated, tainted