Rear end trunk
The term "backside" is typically written as one word.
A backside is the side of something which is opposite the front - or another word for the buttocks.
derriere
They screw off from the backside.
backside
Mirrors with Backside light (Signal Lights)
it reached England in the 14th century from a similar word used in Normandy
if you look from the backside of the car, it`s under the car right side.
backyard backside backward backpack backup
Also known as back-door entrance.
The "Excalibur".
The likely word is "convertible" (a car with retractable roof).The similar word is the adjective comfortable.