replacement

noun

1.
the act of furnishing an equivalent person or thing in the place of another
replacing
Derived from:
replace
2.
someone who takes the place of another person
alternate surrogate
Derived from:
replace
3.
an event in which one thing is substituted for another
permutation substitution switch transposition
Derived from:
replace
4.
a person or thing that takes or can take the place of another
back-up standin swapfiller substitute
Derived from:
replace
5.
filling again by supplying what has been used up
refilling renewal replenishment
6.