Dear,
It is just like the difference between Workman and Employee.
The meaning of both the words is same but the use are different.
Example:
If you ask your Production Manager, Sir, is your wage credited to your account, it will not look good.
You should ask, Sir, is your salary credited to your account.
Like that
If you ask a sweeper who works for few daye in a month, Hello, do you need any clarification regarding your working days and salary, it will not look good.
You should ask, Hello, do you nee any clarification regarding your working days and wage.
Generally, those attendance and salary has been calculated in Monthly basis that can be said Salary and those attendance and salary has been calculating on daily basis that can be said Wage.
Does not matter, whether you are paying them physically daily or monthly. The procedure of calculation makes the difference.