engine

nouns

motor that converts thermal energy to mechanical work

engine

is derived from

is a type of (narrower)

machine that converts other forms of energy into mechanical energy and so imparts motion

something used to achieve a purpose

"an engine of change"

engine

is a type of (narrower)

any entity that produces an effect or is responsible for events or results

a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

is derived from

an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.

"medieval engines of war"

engine

is a type of (narrower)

a device that requires skill for proper use