The word behaviourist 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: 22
Highest Scoring Words With Friends™ Play In The Letters behaviourist
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Seven Letter Word Alert: (63 words)
abortus, abusive, airiest, authors, baiters, barites, bathers, bearish, bitsier, boarish, boaster, boaters, borates, bothers, bousier, bravest, bravoes, breaths, brutish, bursate, bushier, bustier, earshot, harvest, hastier, herbist, herbous, hirsute, irisate, ivories, ivorist, obtuser, obverts, obviate, outhire, outrave, ovaries, overbit, oversat, oversit, rebaits, rebaths, reboast, revisit, revuist, saviour, shouter, sorbate, sorbite, stivier, stourie, subvert, subvote, thrives, urostea, uveitis, various, veritas, vibrate, vibrato, vibrios, virtues, visitor