The word sanctities 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (20 words)
ascents, ascites, caseins, iciness, incests, incises, incites, insects, instate, nictate, secants, seitans, sestina, stances, statice, statics, statins, tetanic, tiniest, titanic