intruder

One who intrudes; one who thrusts himself in, or enters where he has no right or is not welcome.

One who intrudes; one who thrusts himself in, or enters without right, or without leave or welcome; a trespasser.

A person who enters a private residence or place of business with the intention to perform a criminal act.

Someone who intrudes.

Someone who intrudes on the privacy or property of another without permission.