Synonyms of 'maniac'
madman or madwoman
Her son thinks she's a raving lunatic.
At first they all though I was a loony.
She was abducted by a dangerous psychopath.
nutter (British , slang)
basket case (slang)
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An enthusiast is a person who is very interested in a particular activity or subject and who spends a lot of time on it.
He is a great sports enthusiast.
Thesaurus for maniac from the Collins English Thesaurus