关于贿赂的英文

Bribe , Bribery 已经是正式，地道的说法。至于你想说的咖啡钱， 叫tip = 小费 ， a tip for your coffee

too many. here is the list (still not complete)
allurement, bait, blackmail, buyoff, compensation, contract, corrupting gift, corrupt money, enticement, envelope*, feedbag, fringe benefit, gift, goody*, graft, gratuity, gravy*, grease*, hush money*, ice*, incentive, inducement, influence peddling, kickback, lagniappe, lure, payola*, perk*, perquisite, present, price, protection*, remuneration, reward, sop*, sweetener, sweetening, take

Here is some sweetener for your coffee.

rebates 回扣