The word undersurface 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: 22
Highest Scoring Words With Friends™ Play In The Letters undersurface
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Seven Letter Word Alert: (61 words)
asunder, carders, careens, careers, censure, creased, creaser, crusade, dancers, darners, deafens, decanes, decares, defacer, defaces, defuser, earners, encased, endears, endures, ensured, ensurer, erasure, errands, fencers, fenders, funders, furanes, furnace, readers, recaned, recanes, recured, recures, recurse, recused, reducer, reduces, refaced, refaces, refunds, refused, refuser, renders, rereads, rescued, rescuer, scarfed, scarred, secured, securer, seducer, snafued, snarfed, surface, uncared, uncased, uncured, uncurse, unfreed, unfused