The word natatoriums 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: 16
Highest Scoring Words With Friends™ Plays In The Letters natatoriums
:
Seven Letter Word Alert: (42 words)
amounts, amritas, artisan, artsman, atonias, atriums, attains, automat, intorts, intrust, mantras, marinas, martian, martins, matrons, misturn, mutants, nitrous, nostrum, oarsman, outmans, outrant, rainout, rations, rattons, samurai, saurian, stamina, station, stomata, straint, stratum, tantrum, tartans, tourism, tourist, transit, traumas, tritoma, truants, tsarina, tsunami