Synonyms of the word

prowler

• n. One who roves about for prey; one who prowls.

interloper

• n. (obsolete) An unlicensed or illegitimate trader.
• n. One who interferes, intrudes or gets involved where not welcome, particularly a self-interested intruder.

intruder

• n. Someone who intrudes.

sneak

• n. One who sneaks; one who moves stealthily to acquire an item or information.
• n. A cheat; a con artist; a trickster.
• n. An informer; a tell-tale.
• n. (obsolete, cricket) A ball bowled so as to roll along the ground; a daisy-cutter.
• n. (US) A sneaker; a tennis shoe.
• v. (intransitive) To creep or go stealthily; to come or go while trying to avoid detection, as a person who…
• v. (transitive) To take something stealthily without permission.
• v. (transitive, dated) To hide, especially in a mean or cowardly manner.
• v. (intransitive) (informal, especially with on) To inform an authority about another's misdemeanours; to…
• adj. In advance; before release to the general public.
• adj. In a stealthy or surreptitious manner.

stalker

• n. A person who engages in stalking. Originally meant a tracker and hunter or guide of game.
• n. A person who secretly follows someone, sometimes with unlawful intentions.
• n. Any of various devices for removing the stalk from plants during harvesting.
• n. A kind of fishing net.

trespasser

• n. One who trespasses; an interloper.