How to Say "freak" in Spanish
The Spanish word for “freak” is “maníaco” — B2 level.
English → SpanishB2
nounB2
informal: someone obsessed with a specific thing

Examples
Ese hombre conduce como un maníaco.
That man drives like a maniac.
Un maníaco entró en la tienda gritando.
A maniac entered the store shouting.
No seas un maníaco del control; deja que otros ayuden.
Don't be a control freak; let others help.
Using 'Un' vs 'El'
Use 'un maníaco' when talking about any obsessive person, and 'el maníaco' when referring to a specific person you already mentioned.
Confusion with 'Manía'
Mistake: “Tengo un maníaco.”
Correction: Tengo una manía. (Use 'manía' for the obsession itself; 'maníaco' is the person who has it.)
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