The word catechumens 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: 24
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (30 words)
accents, achenes, acumens, anthems, cachets, catches, catechu, cements, chances, chasten, chaunts, cumenes, cuneate, enthuse, ethanes, machete, matches, meanest, menaces, methane, munchee, munches, nutcase, sanctum, staunch, teaches, tumesce, unmatch, unmates, unteach