Dynamo as commutated DC generator

After the discovery of the AC Generator and that alternating current can in fact be useful for something, the word dynamo became associated exclusively with the commutated DC electric generator, while an AC electrical generator using either slip rings or rotor magnets would become known as an alrternator.
An AC electric motor using either slip rings or rotor magnets was referred to as a synchrounous motor and a commutated DC motor could also be called an electric motor though with the understanding that it could in principle operate as a generator.