IPA: /ˈdrɪlər/
KK: /ˈdrɪlər/
A person who operates a machine to make holes in the ground or other materials.
The driller carefully positioned the rig to start the operation.
Driller → It is formed from "drill" (from Middle English *drillen*, meaning to bore or pierce) and "-er" (meaning a person who). A driller is a person who bores or pierces through materials.
Think of someone who 'bores' or 'pierces' through materials — that's what a driller does.