The word underreckoning 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: 28
Highest Scoring Words With Friends™ Play In The Letters underreckoning
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Seven Letter Word Alert: (91 words)
codeine, condign, conking, conning, cording, coreign, corking, cornier, corning, courier, cringed, cringer, crunode, cunning, curried, curring, decking, decrier, denning, dernier, derrick, docking, donning, dorkier, dorking, drinker, droning, drunken, drunker, duckier, ducking, dungeon, dunking, dunnock, educing, encoder, encored, endogen, engined, eroding, eugenic, generic, genuine, geoduck, grinder, grinned, grinner, groined, guckier, guerdon, gunkier, ignored, inducer, inuendo, keening, kerning, kerogen, kneeing, knurred, necking, needing, negroid, nerdier, nocking, nondrug, nongeek, nonking, recking, recured, redoing, reducer, reeking, regrind, reguide, reigned, reigner, reincur, reinked, rending, reunion, reurged, rockier, rocking, rongeur, rounder, runnier, running, uncored, undergo, undoing, unicorn