The word undergarment 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 undergarment
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Seven Letter Word Alert: (72 words)
amender, angered, augment, demurer, denture, derange, detuner, dragnet, dreamer, eardrum, endgame, enraged, erratum, garment, gatemen, gaunted, gaunter, germane, gnarred, grander, granted, grantee, granter, greaten, greater, grenade, grunted, grunter, guarder, gumtree, gurnard, manured, manurer, matured, maturer, meagrer, meander, mundane, mutagen, natured, negated, reagent, reamend, reargue, rearmed, redream, regnant, regrade, regrant, regrate, remated, remnant, renamed, retrade, retread, retuned, reurged, tenured, terrane, treader, trudgen, unarmed, uneager, unearnt, uneaten, unmated, unmeant, unmerge, unnamed, unrated, untamed, untread