obsessor

/əbˈsɛsər/
noun
  1. A person who obsesses over someone or something; someone who cannot stop thinking about a particular person, idea, or activity.
    • He was an obsessor, spending hours each day reading about his favorite celebrity.
    • As an obsessor of vintage cars, he could name every model from the 1960s.
    • The online forum was full of obsessors who discussed the TV show nonstop.
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