* drehen (to turn, rotate, spin) - This is the most general term for turning.
* wenden (to turn around, to reverse) - This refers to changing direction or turning something over.
* biegen (to bend, to turn) - This is used for turning something in a specific direction or making a sharp turn.
* umkehren (to turn around, to reverse) - This is similar to "wenden" but emphasizes the reversal of direction.
For example:
* "Drehe den Schlüssel um!" (Turn the key!)
* "Wende das Auto an der nächsten Ecke!" (Turn the car around at the next corner!)
* "Biege an der Kreuzung nach links!" (Turn left at the intersection!)
* "Umkehren ist nicht möglich!" (It's not possible to turn around!)
The specific word you need will depend on the context of your sentence.