The word underframes 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: 20
Highest Scoring Words With Friends™ Plays In The Letters underframes
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Seven Letter Word Alert: (58 words)
amender, asunder, damners, darners, deafens, defamer, defames, defuser, demeans, demurer, dreamer, eardrum, earners, endears, endures, ensured, ensurer, erasure, errands, farmers, fenders, framers, freeman, funders, furanes, manured, manurer, manures, meander, measure, medusae, menders, murders, readers, readmes, reamend, reamers, rearmed, redream, reframe, refunds, refused, refuser, remands, remends, renamed, renames, renders, rereads, resumed, resumer, smeared, smearer, snafued, snarfed, surname, unarmed, unfreed