The word catarrhines 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (76 words)
acaters, achiest, aitches, anarchs, anthers, antsier, archean, archers, arcsine, arctans, arsenic, arshine, artisan, artsier, atresia, canters, carinae, carnies, carries, carters, cashier, catarrh, certain, chainer, chanter, charier, charter, chasten, chaster, cistern, cithern, cithers, crasher, craters, cretins, cristae, errants, erratic, ethnics, hairnet, hastier, hernias, inchers, inreach, narrate, nastier, nectars, raciest, rainhat, rancher, ranches, ranters, ratrace, recants, rechain, rechart, restain, retains, retinas, retrain, richest, satanic, scanter, scarier, stainer, tarnish, tarries, terrain, tracers, trachea, trainer, trances, tranche, trasher, triarch, tsarina