Synonyms of intruder
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interloperIf 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.
invaderInvaders are soldiers who are invading a country.
• The invaders were finally crushed in June 1719.
• Trespassers will be prosecuted.
Thesaurus for intruder from the Collins English Thesaurus