The word ratcheting 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (37 words)
arching, carting, cattier, catting, certain, chagrin, chainer, changer, chanter, chatter, cithern, citrate, cittern, crating, etchant, etching, granite, hairnet, hatting, hearing, heating, ingrate, inreach, nattier, nictate, nitrate, ratchet, ratting, rechain, tangier, tantric, tearing, tetanic, tighten, tighter, tracing, tranche