The word proprieties 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: 17
Highest Scoring Words With Friends™ Play In The Letters proprieties
:
Seven Letter Word Alert: (33 words)
epitope, erotise, peptise, pieties, pitiers, poetise, porters, potpies, presort, prosper, repipes, reports, reposer, reprise, respire, respite, restore, retires, retries, rioters, rippers, ripstop, roister, ropiest, soppier, stepper, stopper, striper, tippers, tippier, tipsier, toppers, tripper