Stalker

Noun

1. A person who engages in stalking, i.e., quietly approaching animals to be hunted; a tracker or guide in hunting game.
2. A person who secretly follows someone, sometimes with unlawful intentions.
3. Any of various devices for removing the stalk from plants during harvesting.
4. Any bird that walks with a stalking motion.<!-- formerly Gradatores -->
5. A kind of fishing net.<!--Webster 1913-->