Synonyms of 'intruder'
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If you describe someone as an interloper, you mean that they have come into a situation or a place where they are not wanted or do not belong.
She had no wish to share her father with any interloper.
Invaders are soldiers who are invading a country.
The invaders were finally crushed in June 1719.
Thesaurus for intruder from the Collins English Thesaurus
An intruder is a person who goes into a place where they are not supposed to be.