IPA: /ˈpɪlfərər/
KK: /ˈpɪlfərər/
A person who steals small amounts of things, often in a sneaky way.
The store owner caught the pilferer trying to take a candy bar without paying.
Pilferer → It is formed from "pilfer" (from Middle English *pilfren*, meaning to steal) and the suffix "-er" (meaning a person who). A pilferer is a person who steals, especially in small amounts.
Think of someone who is a 'thief' ('pilfer') and the '-er' just means a person. A pilferer is someone who steals.