The word courtliest 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: 15
Highest Scoring Words With Friends™ Play In The Letters courtliest
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Seven Letter Word Alert: (44 words)
clitter, closure, clotter, cloture, cluster, clutter, colters, cotters, coulter, culotte, cultist, cutlets, cutters, elutors, erotics, estriol, litters, loiters, lousier, lucites, lustier, lutites, oculist, outlets, outlier, outlies, recoils, retilts, rutiles, scouter, scuttle, slitter, sluicer, stilter, stourie, stouter, tilters, toilers, toilets, tourist, touters, tricots, trisect, turtles