Crankshafts are an essential component of internal combustion engines, converting linear motion into rotational motion. There are several synonyms for 'crankshaft' including 'crank', 'shaft', 'engine shaft', 'rotating shaft' and 'piston rod'. While all of these terms refer to a similar concept, they each have their own specific context and usage. 'Crank' often has a more informal or colloquial connotation, while 'shaft' is a more technical term. 'Engine shaft' is commonly used in the automotive industry, while 'rotating shaft' is more generally applicable. 'Piston rod' refers specifically to the rod that connects the piston to the crankshaft. All of these synonyms are useful in various contexts, depending on the intended audience and specific application.