The word breathalyser 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: 20
Highest Scoring Words With Friends™ Play In The Letters breathalyser
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Seven Letter Word Alert: (81 words)
abaters, ablates, abraser, abreast, aerates, alerter, arblast, arylate, ashtray, astylar, barleys, barrels, barters, bathers, bearers, beastly, beaters, belayer, berates, betrays, blaster, blather, bleater, blether, brasher, brashly, brayers, breathe, breaths, breathy, earthly, eatable, elaters, eyebars, eyebath, eyelash, halters, healers, hearers, hearsay, heaters, herbals, herbary, herblet, hetaera, lathers, lathery, leather, realers, realest, realter, rebales, rebater, rebates, rebathe, rebaths, reblast, rehears, reheats, relater, relates, relayer, reshare, restyle, retears, sayable, seeably, serrate, shearer, sheerly, shelter, sherbet, slather, stabler, stealer, strayer, tearers, tersely, thereby, trasher, trebles