replacement
n. C / U C1 Advanced Oxford US //ɹɪˈpɫeɪsmənt// UK //ɹɪplˈeɪsmənt// re·place·ment
n. a person or thing that takes the place of another. You use this when you need to swap something old or broken for something new.
n. a person or thing that takes the place of another; the act of substituting one entity for another.
The shop sent a replacement for the broken lamp.
The manager is looking for a temporary replacement while the lead designer is on leave.
Finding a suitable replacement for the retiring CEO proved difficult, as the board required a candidate with both technical expertise and significant international experience.
From replace + -ment.
Usage
Uncountable when referring to the process of substituting; countable when referring to the specific person or object being substituted.