der Bankräuber
bank robber
A person who robs a bank in order to steal money or other valuables.
Die Polizei konnte den Bankräuber kurz nach der Tat festnehmen.
The police were able to arrest the bank robber shortly after the crime.

bank robber
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bank robber
A person who robs a bank in order to steal money or other valuables.
Die Polizei konnte den Bankräuber kurz nach der Tat festnehmen.
The police were able to arrest the bank robber shortly after the crime.

The word is built very transparently and is made up of 'Bank' (bank) and 'Räuber' (robber). So it refers to a person who robs a bank.
Der maskierte Bankräuber forderte das Geld.
The masked bank robber demanded the money.
The word belongs to a word family: the person is the 'Bankräuber' (bank robber), the crime is the 'Bankraub' (bank robbery), and the action is 'eine Bank ausrauben' (to rob a bank).
Nach dem Bankraub floh der Täter mit einem schnellen Auto.
After the bank robbery, the perpetrator fled in a fast car.
In the context of police work, 'Bankräuber' (bank robber) is often used with verbs such as 'fassen' (to catch), 'festnehmen' (to arrest), 'verhaften' (to arrest), or 'jagen' (to hunt/chase).
Die Polizei konnte den flüchtigen Bankräuber nach zwei Tagen fassen.
The police were able to catch the fleeing bank robber after two days.
robber
'der Räuber' and 'der Bankräuber' both refer to a person who steals using violence or threats. 'Räuber' is the more general term. A robber can appear, for example, on the street, in a shop, or in a story. 'Bankräuber' is much more specific: this person robs a bank in order to steal money or valuables. The words can be confused because every bank robber is also a robber. But not every robber is a bank robber.

Nach dem Überfall erkannte ein Zeuge den Bankräuber auf einem Foto.
After the robbery, a witness recognized the bank robber in a photo.
Die Polizei sucht einen Räuber, der mehrere Menschen im Park bedroht hat.
The police are looking for a robber who threatened several people in the park.