That area of the car that acts as vertical support for Car’s window area or Greenhouse is known as Pillars. These Pillars are named as A,B,C,D and so on as we move from Front end of car to rear end of the car 


The front portion of the car which covers the engine, battery, fan, radiator, etc is known as Bonnet. it is called Hood as well.


The rear area of the car which is separate from the passenger area and is used to keep luggage is known as the Boot or Trunk. 


The area just below the windshield, we can say it as a base of the windshield as well, is known as Cowl.


The panel which covers the wheels of the car that starts from the bumper and goes to the door line excluding the engine compartment area is known as Fender. The fender is also called the quarter panel.