IPA: /ˈpaʊdə(r)ər/
KK: /ˈpaʊdərər/
A person or thing that applies or uses powder, often for a specific purpose such as cooking or cosmetics.
The powderer carefully dusted the cake with powdered sugar before serving it.
Powderer is formed from "powder" (from Old French *poudrer*, meaning to make into powder) and "-er" (meaning a person who). A powderer is a person who makes or uses powder.
Think of someone who 'makes' ('-er') something into 'powder' — that's what a powderer does.