IPA: /ˈpɔːrə/
KK: /ˈpɔrər/
A person or thing that pours a liquid from one container to another.
The waiter was a skilled pourer, filling the glasses without spilling a drop.
Pourer → It is formed from "pour" (from Old French *pourer*, meaning to flow or cause to flow) and "-er" (meaning a person who). A pourer is a person who causes something to flow, typically a liquid.
Think of someone who 'causes to flow' ('pour') — that's why a pourer is a person who pours.