AWS or Annual Wage Supplement is commonly known to employees as
the 13th month Bonus that most companies gave out either at the
year end or prior to Chinese New Year, thus basically it's the same
component.
As for Bonus, there are varying types of bonus that a company can
give out like Performance Bonus, Variable Bonus, Profit-sharing
Bonus. Different criterias and amount for each type and not all
companies give. Lately under recommendations from National Wage
Council, a new component is set within the monthly pay known as MVC
or Monthly Variable Component, which is actually the Variable
Bonus. Instead of been paid out in lumpsum, it's broken up into 12
monthly components and in times that the company doesn't do well
and need to have a pay cut, the MVC will ease the load.