The word accelerative 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 accelerative
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Seven Letter Word Alert: (26 words)
accrete, acerate, acerval, activer, article, avarice, calcite, caviler, circlet, clavate, clavier, cleaver, crevice, elative, elevate, evictee, reavail, receive, recital, reelect, relieve, travail, treacle, variate, velaria, velaric