IPA: /ˈstɛnslər/
KK: /ˈstɛnslər/
A person who creates or uses stencils, which are templates used to produce designs or letters on a surface.
The stenciller carefully applied paint through the stencil to create a beautiful mural.
Stenciller → It is formed from "stencil" (from Old French *estencel*, meaning a pattern or design) and "-er" (meaning a person who). A stenciller is a person who uses a stencil to create designs or patterns.
Think of a person who uses a 'pattern' ('stencil') to create designs — that's what a stenciller does.