stalker
//ˈstɔːkər//
Noun
stalkerSingular
stalkersPlural
1
A person who obsessively follows, watches, or harasses another person, often causing fear or distress.
She reported the stalker to the police after he followed her home several times.
2
A hunter who stealthily pursues game or prey.
The stalker moved silently through the forest, tracking the deer.