The word creaseproof 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: 20
Highest Scoring Words With Friends™ Play In The Letters creaseproof
:
Seven Letter Word Alert: (31 words)
acerose, careers, carpers, coarser, corpora, creaser, escaper, forceps, forcers, poofers, preface, prefers, prerace, proofer, reapers, rearose, refaces, repaces, reparse, reposer, reproof, rerapes, reroofs, rescope, rescore, respace, roofers, scooper, scraper, spearer, spoofer