The word slenderizing 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: 27
Highest Scoring Words With Friends™ Play In The Letters slenderizing
:
Seven Letter Word Alert: (56 words)
deleing, deniers, denizen, dingier, dingies, dinners, eleidin, eliding, endings, engined, engines, gelders, genders, gilders, girdles, girlies, girnels, gliders, greisen, grinned, inlines, insider, ledgers, leering, legends, lenders, lending, lensing, lignins, lindens, lingers, linings, linseed, needing, redline, reeling, regilds, reigned, reining, relined, relines, rending, resized, ridings, rinsing, sedgier, seeding, seizing, sending, sidling, singled, slender, sliding, slinger, zingers, zingier