The word estimators 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: 13
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (45 words)
artiest, artists, atomise, attires, iratest, isomers, maestro, masters, matters, metrist, misseat, missort, misters, mitoses, moister, mortise, mossier, omitter, retoast, rosiest, rotates, satires, seamost, sitters, smartie, smatter, smiters, somites, sorties, staters, statism, stomate, stomies, stories, straits, streams, striate, stroams, taoists, tasters, tastier, toaster, tritoma, tsarism, tsarist