The word determinism 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™ Play In The Letters
Seven Letter Word Alert: (56 words)
deities, dements, demerit, deniers, destine, diester, dieters, dieties, dietine, dimeter, dimmers, dimmest, dirties, ditsier, entries, immense, immerse, inditer, indites, insider, interim, itemise, menders, merited, metrise, midterm, minders, mindset, minters, mintier, misdeem, misedit, mistier, mistime, mitered, nitride, reedits, reemits, remends, reminds, remined, remines, remints, retimed, retimes, stemmed, sterned, stimied, tenders, termini, tidiers, timider, tinders, tridems, trienes, trimmed