just that a brick
An Adobe Brick
For the same reason most things are called what they are. At some point someone said "this is a brick" and the name stuck.
Brick is often used to refer to one kilogram of a drug, but it may or may not be crack cocaine.
A brick kiln.
Solid
I have heard about something called brick veneer, but I'm not sure what it is. What is brick veneer made of?
A flat topped mud brick tomb is called a mastaba.
I assume it's just the bottom. It might be called the base of the brick though.
If a person is called a brick maker that means he makes bricks.
They can be called "hand tossed"
Bat