The word circularization 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: 33
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (44 words)
account, accrual, acicula, aclinic, actinic, alicant, auction, auroral, autocar, caloric, canular, carinal, carrion, caution, circuit, clarion, coaltar, colicin, conical, council, cranial, crucial, curacao, curator, currant, curtail, curtain, czarina, initial, lacinia, laconic, lunaria, lunatic, natural, nautica, occular, railcar, rainout, rancour, truncal, tzarina, zacaton, zoarial, zonular