intruder ( intruders plural ) An intruder is a person who goes into a place where they are not supposed to be. n-count
Translation English - Cobuild Collins Dictionary
burglar, gate-crasher (informal) infiltrator, interloper, invader, prowler, raider, snooper (informal) squatter, thief, trespasser
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"