The word princedoms 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (41 words)
ceroids, cinders, coiners, copiers, crimped, crimson, crisped, crispen, cronies, demonic, discern, dormice, impends, imposed, imposer, incomer, incomes, indorse, microns, mincers, minders, miscode, misdoer, misdone, moderns, nimrods, nordics, periods, pincers, ponders, porcine, princes, promise, recoins, reminds, rescind, respond, rosined, scorned, spermic, spinode