treacher
A traitor or deceiver.
archaic
“Fruits and treachers,” he said. “Nothin' in there but treachers and fruits. I see 'em goin' in and out all day, in their tammyshanters and their fur-covered shoes. Fruits and treachers, the place is full of 'em.”
Where it comes from
From Middle English trecher, from Old French trecheor (modern tricheur), from trechier, tricher (“to cheat, trick”). Compare English trick.
Adapted from the Wiktionary entry treacher (CC BY-SA 4.0).