IPA: /ˈsækrɪfaɪsər/
KK: /ˈsækrɪfaɪsər/
A person who gives up something valuable, often for the sake of others or for a greater cause.
The sacrificer gave up their own comfort to help those in need.
Sacrificer → It is formed from "sacrificium" (from Latin, meaning a sacred offering) and "-er" (meaning a person who). A sacrificer is a person who makes a sacred offering or performs a sacrifice.
Think of someone who makes a 'sacred offering' — that's what a sacrificer does.