The word manageableness 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: 25
Highest Scoring Words With Friends™ Play In The Letters manageableness
:
Seven Letter Word Alert: (33 words)
ageless, anneals, bagless, baleens, balsams, bananas, bangles, baseman, basemen, beagles, beseems, embases, enables, enamels, enseals, galenas, gambles, gemless, geneses, lasagna, lasagne, manages, mangles, manless, massage, measles, melange, menages, message, nabales, salaams, seabags, seeable