The word reformists 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: (35 words)
firmest, firmoss, foister, forests, formers, forties, fosters, froster, isomers, missort, misters, mitoses, moister, mortise, mossier, reforms, resifts, resorts, restirs, retrims, rioters, roister, rosiest, rosters, sifters, smiters, softies, somites, sorters, sorties, stomies, stories, strifes, tremors, trimers