In British English, the metal cover over the engine at the front of a car is called the bonnet.
1. Slowly he climbed out, unlocked the boot and laid the rucksack on the bonnet.
2. I unlocked the boot and laid the tools on the bonnet.
In American English, this cover is called the hood.
3. Patrick gets out of the car, opens the hood, and peers into it.
4. …the raised hood, under which I had bent to watch the mechanic at work.
In both British and American English, a bonnet can also be a type of hat tied under the chin. In former times, bonnets were worn by women, but nowadays only babies’ hats are referred to as bonnets.
5. Rhoda was wearing a bonnet and a kind of long travelling cape.
In both British and American English, a hood is also a part of a coat or jacket which can be pulled up over your head to protect you from bad weather.
6. The weather had turned so cold that I had to bicycle with the hood of my anorak pulled up over my little orange hat.