trespasser
tres·pas·ser
noun
1.
someone who intrudes on the privacy or property of another without permission
Origin
From trespass + -er.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.