Bonus

Etymology
From bonus:.

Because Latin has gender, this would mean "a good man (male)". Properly formed, the word should be bonum (neuter gender; the plural would be bona), meaning "a good thing". This would mirror the many other neuter gender words adopted into English, like maximum:, minimum:, premium:, optimum:. See also bona fide:.

Noun

 * 1) Something extra that is good
 * 2) An extra sum given as a premium, e.g. to an employee
 * The employee of the week receives a bonus for his excellent work.

Verb

 * 1)  To pay a bonus, premium

Thesaurus
Trinkgeld, balance, bonus system, bounty, bribe, buried treasure, compensation, consideration, decoration, discovery, dividend, donative, double time, extra, extra added attraction, extra dash, fee, filigree, filling, fillip, find, finding, flourish, foundling, frill, fringe benefit, gratuity, gravy, grease, hand-out, honorarium, incentive pay, inducement, lagniappe, largess, largesse, leftover, liberality, margin, ornament, overage, overmeasure, overplus, overrun, overset, overstock, oversupply, overtime pay, padding, palm oil, perk, perks, perquisite, perquisites, plus, pourboire, premium, remainder, remuneration, reward, salve, solatium, something extra, spare, sportula, stuffing, superaddition, surplus, surplusage, sweetener, tip, treasure trove, trimming, trouvaille, trove, twist, waifs, waifs and strays, windfall, windfall money, windfall profit, wrinkle