freak
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freak
A person who is extremely enthusiastic about a particular thing and engages with it intensively, often in an unconventional way.
Er ist ein totaler Computer-Freak und kennt sich mit allem aus.
He is a total computer freak and knows about everything.
'Freak' is a colloquial word taken directly from English. It is mainly used in spoken language and in informal contexts.
Er ist ein echter Freak, wenn es um Star Wars geht.
He is a real freak when it comes to Star Wars.
In the positive meaning 'Fan' (fan) or 'Experte' (expert), 'Freak' is very often used as the second part of a compound. The first part names the area of interest.
Mein Bruder ist ein totaler Technik-Freak.
My brother is a total technology freak.
When 'Freak' is used on its own as a label for a person, the meaning is often negative and refers to a strange or eccentric person.
Die Kinder nannten den alten Mann einen Freak, weil er allein lebte.
The children called the old man a freak because he lived alone.
fan
'der Fan' and 'der Freak' can both describe a person who likes something very much. 'Fan' is neutral and often positive: a fan admires a band, a team, a person, or likes something very much. 'Freak' is stronger. It means someone who is extremely intensely involved with something, sometimes in an unusual way. In addition, 'Freak' can also be derogatory and mean a strange person. So you should be careful with it. The words can be confused because both express enthusiasm. For normal enthusiasm, 'Fan' is more natural; for very strong, specific, or somewhat unusual enthusiasm, 'Freak' is more fitting.
Mein Bruder ist ein Technik-Freak und baut seine Computer selbst zusammen.
My brother is a tech freak and builds his computers himself.
Wir sind große Fans von dieser kleinen Pizzeria in der Altstadt.
We are big fans of this little pizzeria in the old town.