The word calendering 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™ Plays In The Letters
Seven Letter Word Alert: (75 words)
adenine, aligned, aligner, angelic, angered, annelid, cairned, candler, cannier, carding, clanged, cleaned, cleaner, cleared, clinger, craning, cringed, dancing, dangler, darling, darning, dealign, dealing, decalin, declare, decline, decrial, deleing, deraign, derange, earning, elegaic, elegiac, engined, enlarge, enraged, general, generic, glacier, glanced, glancer, gleaned, gleaner, gnarled, gracile, grained, grenade, grinned, lagered, lancing, landing, larding, leading, leaning, learing, learned, leering, lending, lineage, nearing, needing, radicel, radicle, reading, realign, recaned, reclang, reclean, recline, redline, reeling, reigned, relaced, relined, rending