Which one is correct, cylinder or cylinder?

Which one is right, cylinder or cylinder?

The writing is correct. But it does not refer to the same object

The cylinder is the actuator of the pneumatic component, and the cylinder is the automotive power component.

Cylinder: a cylindrical metal part that guides the piston in linear reciprocating motion

Cylinder: A cylindrical hollow chamber in an engine, which contains a piston pushed by the pressure or expansion force of the working fluid. A similar but non-cylindrical part in some special engines