alien 5 Associations

stranger unknown intruder (generic term) interloper (generic term) trespasser (generic term)

bother 6 Associations

intrude (generic term) irrupt (generic term)

infiltrator 11 Associations

intruder (generic term) interloper (generic term) trespasser (generic term)

interloper 10 Associations

intruder trespasser entrant (generic term) unwelcome person (generic term) persona non grata (generic term)