What is another word for intruder?
Pronunciation: [ɪntɹˈuːdə] (IPA) 
An intruder is someone or something that enters a place, belonging or activity without permission or authorization. However, there are various synonyms to describe an intruder such as trespasser, interloper, infiltrator, invader, breaker, and raider. A trespasser typically refers to someone who enters private property without permission. An interloper describes someone who interferes or meddles in the affairs of others. An infiltrator suggests someone who enters secretively or tries to get into a particular group. An invader implies someone who intrudes in a hostile action. A breaker pertains to someone who enters forcefully by breaking a physical barrier, while a raider denotes someone who enters a place to rob or plunder.
