IPA: /ˈleɪbələr/
KK: /ˈleɪbələr/
A person or a machine that creates or attaches labels to items or products.
The labeler quickly printed and attached stickers to all the boxes.
Labeler → It is formed from "label" (from Old French *label*, meaning a small note or tag) and "-er" (meaning a person who). A labeler is a person who applies or creates labels.
Think of a person who creates or applies a 'small note' ('label') — that's what a labeler does.