maniac
/ˈmeɪ.niˌæk/ noun B2- An insane person, especially one who suffers from a mania. · She was driving like a maniac.
- A fanatic, a person with an obsession. · He's a manga maniac.
Plural maniacs
From the library
The doctor most kindly took charge of me, and it was well he did so, for I had a fit in the station, and before we reached home I was practically a raving maniac.
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