The word decrescendos 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (49 words)
censers, censors, coerced, coerces, concede, crossed, decenes, decoder, decodes, decreed, decrees, descend, deseeds, dresden, dressed, encoded, encoder, encodes, encored, encores, endorse, essence, necrose, needers, nodders, oddness, receded, recedes, recoded, recodes, reddens, redness, reseeds, resends, sconced, sconces, scorned, screeds, screens, seceded, seceder, secedes, secerns, seconds, seeders, senders, sneered, soccers, soddens