Internal-combustion engine and Pancake engine

Internal-combustion engine noun - A heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine.

Pancake engine and internal-combustion engine are semantically related. In some cases you can use "Pancake engine" instead a noun phrase "Internal-combustion engine".

Internal-combustion engine and pancake engine are semantically related. You can use "Internal-combustion engine" instead a noun phrase "Pancake engine".