Noun
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someone who intrudes on the privacy or property of another without permission
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interloper,
trespasser |
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entrant a commodity that enters competition with established merchandise; "a well publicized entrant is the pocket computer"
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unwelcome person,
persona non grata a person who for some reason is not wanted or welcome
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boarder a pupil who lives at school during term time
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crasher,
gatecrasher,
unwelcome guest someone who gets in (to a party) without an invitation or without paying
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infiltrator an intruder (as troops) with hostile intent
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encroacher,
invader someone who enters by force in order to conquer
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penetrator an intruder who passes into or through (often by overcoming resistance)
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prowler,
sneak,
stalker someone who prowls or sneaks about; usually with unlawful intentions
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thruster,
pusher a small rocket engine that provides the thrust needed to maneuver a spacecraft
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squatter someone who settles on land without right or title
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