The word regularities 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: 16
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (95 words)
aeriest, aiglets, aigrets, airiest, alerter, arguers, artsier, augites, auletes, austere, eaglets, earlier, elaters, elegist, elegits, eluates, erasure, estrual, euaster, gaiters, garrets, garters, gearset, gelates, gesture, girlier, girlies, glister, gluiest, graters, greaser, greater, grister, gristle, guitars, gustier, gutsier, irisate, largest, leaguer, leagues, legates, leisure, ligates, lustier, realers, realest, realise, realist, realter, reargue, rearise, regears, reglues, regrate, regrets, regular, relater, relates, reliers, restage, resurge, retails, retears, retiles, retires, retrial, retries, reurges, rituals, rugrats, rustier, rustler, rutiles, saltier, saluter, seriate, serrate, siltier, slatier, stagier, stealer, sterile, sugarer, surlier, surreal, tarries, tearers, tearier, trailer, triages, ugliest, uralite, ureters, utilise