The word regularising 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: 19
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (83 words)
airguns, airings, airline, aisling, aligner, anglers, angrier, arguers, arguing, arising, earring, erasing, gainers, gargles, garners, gearing, genials, gingers, girlier, girlies, girling, girnels, girners, glaring, glueing, gnarler, grainer, granule, guineas, gurgles, gurners, insular, insurer, inulase, laggers, lairing, langurs, learing, leasing, lingers, luggers, naggers, nailers, niggler, raggier, railing, rainier, raising, rangers, rangier, realign, rearing, regains, regular, renails, reusing, riggers, ringers, ruggers, rulings, saggier, sailing, sealing, searing, seguing, serging, sieging, signage, slinger, slugger, snagger, snaggle, snarler, sniggle, snugger, snuggle, sugarer, surging, surlier, surreal, unagile, urgings, urinals