engines

[engine.n.01] as in: motor that converts thermal energy to mechanical work

[engine.n.02] as in: something used to achieve a purpose

[locomotive.n.01] as in: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

[engine.n.04] as in: an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.

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