The word underlayment 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™ Plays In The Letters underlayment
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Seven Letter Word Alert: (72 words)
alerted, altered, amender, amylene, annulet, deanery, delayer, denture, detuner, draymen, eluated, emendal, emerald, emulant, emulate, enteral, eternal, lantern, launder, laundry, layered, learned, lunated, lyrated, mandrel, mantled, manured, matured, meadery, meander, metaled, mundane, mutedly, natured, neutral, numeral, nutmeal, reamend, redealt, related, relayed, remated, remnant, renamed, retuned, tannery, tenured, treadle, trundle, trunnel, unalert, unalter, unarmed, undealt, unearnt, uneaten, unladen, unlayer, unlearn, unmanly, unmated, unmeant, unnamed, unrated, unready, untamed, untread, yardmen, yealmed, yealmer, yearend, yearned