intruder
[noun]
Synonyms: trespasser, gate-crasher (informal), infiltrator, interloper, invader, prowler

[TahlilGaran] English Synonym Dictionary ▲

in‧trud‧er /ɪnˈtruːdə $ -ər/ noun [countable]

1. someone who illegally enters a building or area, usually in order to steal something:
The police think the intruder got in through an unlocked window.

2. someone who is in a place where they are not wanted:
At first I felt like an intruder in their family.

[TahlilGaran] Dictionary of Contemporary English ▲

intruder
noun
ADJ. unwanted, unwelcome | masked
VERB + INTRUDER catch, disturb, find, startle, surprise He surprised a masked intruder in the kitchen.
deter, keep away/out Dogs can deter unwelcome intruders.
tackle He was stabbed when he tackled an intruder armed with a knife.
repel Staff were instructed to repel intruders with physical force, if need be.
INTRUDER + VERB break into, force their way into Intruders had forced their way into the house.
INTRUDER + NOUN alarm
PREP. against ~s security measures against intruders

[TahlilGaran] Collocations Dictionary ▲