The word submergences 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: 25
Highest Scoring Words With Friends™ Plays In The Letters submergences
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Seven Letter Word Alert: (29 words)
bemuses, beseems, bungees, censers, censure, cerumen, crubeen, cumenes, emerges, emerses, enbuses, ensures, essence, geneses, genuses, guesser, mungers, numbers, rebegun, recuses, reneges, renegue, rescues, resnubs, resumes, screens, secerns, secures, unmerge