The word cessation 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: 13
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (25 words)
aconite, actions, ascents, ascites, atonics, caisson, caseins, casinos, cations, cession, consist, cosiest, cosines, incests, insects, nosiest, notices, octanes, oecists, secants, section, seitans, sestina, stances, tocsins