The word auspiciousness 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: 23
Highest Scoring Words With Friends™ Play In The Letters auspiciousness
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Seven Letter Word Alert: (34 words)
asepsis, auspice, caisson, caseins, casinos, cassons, cession, cosines, cousins, cuisine, eosinic, iciness, incises, inscape, ionises, isospin, nicosia, osseins, pansies, passion, possess, pounces, psionic, pussies, scapose, seasons, session, sinuous, sinuses, sissies, spinose, spinous, spouses, uncapes