The word ratiocinative 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (42 words)
aconite, activer, avarice, aviatic, aviator, avionic, carinae, carvone, cattier, certain, citator, citrate, citrine, cittern, convert, cornett, enactor, erotica, evictor, inciter, inertia, inviter, invitro, invoice, nattier, nictate, nitrate, nitrite, nittier, otarine, ovarian, overact, ricotta, tantric, teacart, tetanic, tintier, titanic, variant, variate, vitiate, vitrine