The word forecaster 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (43 words)
acerose, careers, carrots, carters, caterer, cerates, coarser, coaster, crafter, craters, creaser, creates, creator, crofter, erector, factors, ferrets, forcers, fraters, froster, rafters, reactor, rearose, recoats, recraft, recrate, rectors, refaces, refects, refract, refrets, reroast, rescore, restore, retears, retrace, roaster, roseate, serrate, tearers, terrace, tracers, trocars