The word underpayment 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: 24
Highest Scoring Words With Friends™ Play In The Letters underpayment
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Seven Letter Word Alert: (65 words)
adepter, amender, amputee, deanery, denture, detuner, draymen, epurate, erupted, manured, matured, meadery, meander, mundane, natured, payment, pendant, pendent, penname, pentane, pentyne, permute, predate, premade, pretend, prudent, putamen, reamend, redtape, remated, remnant, renamed, repayed, reputed, retaped, retuned, retyped, tannery, tapemen, tapered, tempera, tempura, tenured, tramped, trumped, umpteen, unarmed, undrape, unearnt, uneaten, unmated, unmeant, unnamed, unrated, unready, untamed, untaped, untread, untyped, updater, uprated, uptrend, yardmen, yearend, yearned