The word underrates 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: 13
Highest Scoring Words With Friends™ Plays In The Letters underrates
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Seven Letter Word Alert: (65 words)
asunder, austere, darners, darters, dearest, denture, detuner, detunes, earners, earnest, eastern, endears, endures, ensured, ensurer, erasure, errands, errants, euaster, natured, natures, nearest, neuters, nutseed, ranters, readers, reasted, redates, renders, renters, rereads, rerents, retards, retears, retrade, retread, retuned, retunes, returns, saunter, sauteed, sedater, serrate, standee, stander, starred, sterane, sterned, sterner, tasered, tearers, tenders, tenured, tenures, terrane, traders, treader, tundras, turners, undrest, unrated, unreset, unsated, untread, ureters