betrayer

n.

best-seller, best-selling, bestial, bestiality, bestially, bestiary, bestir, bestow, bestowal, bestride, bet, bet on, beta, bete noire, betel, betel-nut, betide, betoken, betray, betrayal, betroth, betrothal, betrothed, better, better off, better-off, betterment, betting-shop, bettor, between, between (also in between), betwixt, bevel, bevel gear, beverage, bevy, bewail, beware, bewilder, bewildering,