Question

one word substitution
gain or profit over and above one's salary or wage​

Answer 1

ANSWER:  

       The one substitution will be 'bonus'.

EXPLANATION:

     One word substitution is simply a single word which is used to replace a line/sentence. The one word substitution for “gain or profit over" and above one's "salary or wage​” will be 'bonus'.

    As bonus is a sum of money added to a person's actual salary as a reward for good performance, bonus would be the right word to substitute the line as the meaning of bonus is the same.

Answer 2

One word substitution:

The word for "gain or profit over and above one's salary or wage​" is bonus.

Explanation:

• The bonus payment is amount of money paid to the employees in-addition to base salary.
• It is given based on the annual turnover and current value of the company stock.
• It acts as a incentive for the employees based on their economic gain for the company.
• It is also given based on the performance and in some cases the bonus is higher than the base salary.