The word breathalyse 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: 19
Highest Scoring Words With Friends™ Play In The Letters breathalyse
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Seven Letter Word Alert: (59 words)
abaters, ablates, abreast, aerates, arblast, arylate, ashtray, astylar, barleys, bathers, beastly, beaters, belayer, berates, betrays, blaster, blather, bleater, blether, brashly, breathe, breaths, breathy, earthly, eatable, elaters, eyebars, eyebath, eyelash, halters, healers, hearsay, heaters, herbals, herblet, hetaera, lathers, lathery, leather, realest, rebales, rebates, rebathe, rebaths, reblast, reheats, relates, restyle, sayable, seeably, sheerly, shelter, sherbet, slather, stabler, stealer, tersely, thereby, trebles