The word baptistery 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: 18
Highest Scoring Words With Friends™ Plays In The Letters baptistery
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Seven Letter Word Alert: (34 words)
artiest, attires, baiters, baptise, baptist, barites, batters, battery, battier, betrays, bitpart, bitrate, bitters, iratest, parties, pastier, patters, patties, petabit, pirates, pyrites, ratbite, rebaits, satiety, spatter, striate, stripey, tapster, tastier, terabit, tipster, traipse, typebar, yttrias