The word undercarriage 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 undercarriage
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Seven Letter Word Alert: (58 words)
acreage, angered, angrier, arraign, arrange, cairned, carding, carinae, carnage, carried, carrier, cringed, cringer, curried, currier, curring, decrier, deraign, derange, dernier, drainer, earring, educing, enraged, eugenic, gaudier, generic, gnarred, grained, grainer, grander, grenade, grinder, guarani, guarder, gurnard, inducer, nerdier, randier, rangier, readier, reading, reargue, rearing, recaned, recured, reducer, regrade, regrind, reguide, reigned, reigner, reincur, reurged, unaired, uncaged, uncared, uneager