The word subterraneous 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: 19
Highest Scoring Words With Friends™ Play In The Letters subterraneous
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Seven Letter Word Alert: (154 words)
abortee, aborter, abortus, absents, abusers, arbours, arbutus, arouser, arouses, arrests, atoners, auburns, austere, auteurs, autobus, banters, baronet, barrens, barters, basters, bearers, beaters, berates, besorts, boaster, boaters, boneset, bonuses, boranes, borates, boreens, breasts, bureaus, burners, burnout, bursars, bursate, busters, butanes, butenes, earners, earnest, eastern, enbuses, enrober, enrobes, ensears, ensurer, ensures, erasers, erasure, errants, estrone, estrous, euaster, natures, nearest, nesters, neuters, nursers, nurture, obtuser, oestrus, ornater, ousters, outburn, outearn, outruns, outsees, ranters, rasters, rearose, reasons, rebases, rebater, rebates, reboast, rebores, reburns, reburst, renests, renters, rerents, reroast, reroute, reseats, resents, resnubs, resorbs, resorts, resters, restore, retears, retours, retunes, returns, roaster, roseate, rosters, routers, rubouts, sateens, saunter, seaters, senates, senator, sensate, serrate, snarers, snorers, snorter, soarers, soberer, sorbate, sorbets, sorters, sourest, starers, stenose, sterane, stereos, sterner, stoners, strobes, subnets, subnote, subsort, subtone, subtree, sunstar, sutures, tearers, teasers, tensors, tenuous, tenures, terrane, tonsure, toruses, tourers, treason, trouser, turbans, turners, unburst, unreset, unrests, unrobes, unseats, unsorts, untruer, ureases, ureters, urostea