The word catenaries 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (53 words)
acaters, acerate, aerates, aeriest, antsier, arcsine, arctans, arenite, arsenic, artisan, atresia, canters, careens, carinae, carnies, caseate, centers, centres, cerates, certain, cistern, creates, cretins, cristae, earnest, eastern, enteric, enticer, entices, entries, nastier, nearest, nectars, raciest, recanes, recants, recites, reenact, restain, retains, retinas, satanic, scanter, scenter, seriate, sincere, stainer, sterane, trainee, trances, triaene, trienes, tsarina