The word embitterments 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: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (40 words)
bemires, betimes, betrims, betters, bitters, eeriest, emitter, enemies, entrees, entries, immense, immerse, itemset, meeters, members, metrise, metrist, minters, mittens, netters, rebites, reemits, remeets, remines, remints, retimes, retints, smitten, teemers, teenier, teeters, tenters, tentier, termite, testier, timbers, timbres, tinters, titters, trienes