bonus
This term carries a strong psychological association with reward and gratification. It describes a positive addition that exceeds expectations, creating a feeling of windfall or unexpected gain. In professional settings, it is a formal financial incentive, whereas in casual conversation, it refers to any lucky extra.
Countable when referring to a specific payment or a single extra benefit. Uncountable when discussing the general concept of extra compensation in a corporate policy.
Meanings
An extra sum of money given as a reward from an employer to an employee.
"The company gave everyone a Christmas bonus."
Something welcome and unexpected that is extra or additional to what is required or usual.
"The hotel room had a great view of the ocean as a bonus."