Combustion-chamber is an essential component of internal combustion engines, which is responsible for the combustion process. However, there are several synonyms that can be used to describe this part. The first one is the cylinder or the cylinder head. It is the upper part of the engine that accommodates the combustion space. Another synonym is the firing chamber or combustion cylinder. These terms describe the area where fuel is mixed with air, resulting in combustion that produces power in the engine. Other possible synonyms for combustion-chamber include the engine block, combustion space, and combustion cavity. Regardless of the term used, the combustion chamber plays a crucial role in ensuring the smooth operation of an engine.