The word underplaying 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: 24
Highest Scoring Words With Friends™ Plays In The Letters underplaying
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Seven Letter Word Alert: (97 words)
aligned, aligner, angrily, annelid, dangler, darling, darning, dealign, dealing, denying, deraign, diurnal, draping, draying, dueling, earning, earplug, eluding, endplay, gardeny, gaudier, gaudily, gnarled, grained, grandly, granule, grinned, guanine, guilder, gunnery, gunplay, inanely, indulge, inlayer, landing, languid, larding, lauding, launder, laundry, leading, leaning, leaping, learing, lending, lipread, nearing, pealing, pending, penguin, pingled, pingler, pinnule, plagued, plainer, planing, planned, planner, playing, plenary, plunder, plunged, plunger, praline, praying, predial, preying, pruning, pudgier, punnier, randily, rapidly, readily, reading, realign, reaping, relying, rending, unagile, unaired, unalign, unangry, undrape, undying, unideal, unladen, unlayer, unlearn, unlined, unready, upgrade, yarding, yarning, yauping, yealing, yeaning, yelping