The word nierembergia 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: 21
Highest Scoring Words With Friends™ Plays In The Letters nierembergia
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Seven Letter Word Alert: (34 words)
angrier, barmier, barring, beaming, bearing, begrime, bringer, brinier, eagerer, earring, emerger, gerbera, germane, germier, grainer, greener, grimier, imagine, mangier, mariner, marring, meagrer, rainier, rangier, reaming, rearing, rebegan, rebegin, regimen, regreen, reigner, reimage, remerge, reneger