[Capitalist Eric]

Unless it's a solid fuel rocket -- which is called a rocket motor.

This is true- to people who aren't engineers, and don't understand the difference.

[Dan Evans]

This is true- to people who aren't engineers, and don't understand the difference.

No, that's what rocket engineers call them, motors:

ABSTRACT:

The Space Shuttle solid rocket motor case assembly joints are sealed using conventional O-ring seals. The 5500+°F combustion gases are kept a safe distance away from the seals by thick layers of insulation. Special joint-fill compounds are used to fill the joints in the insulationto prevent a direct flowpath to the seals. On a number of occasions, NASA has observed in several of the rocket nozzle assembly...