The word reassigning 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (46 words)
aggress, airings, arising, asinine, earning, ensigns, erasing, gainers, gaining, gassier, gassing, gearing, gingers, ginseng, girning, ingrain, ingress, insaner, naggers, nearing, raining, raising, raisins, ranging, regains, reining, resigns, ringing, rinsing, risings, saggers, saggier, searing, sensing, serging, sieging, siennas, signage, signers, signing, singers, singing, sinners, snagger, snaring, sringas