Aeon and Era

Aeon noun - A long or seemingly long period of time.

Era is a synonym for aeon in period of time topic. In some cases you can use "Era" instead a noun "Aeon", when it comes to topics like extent of time. popular alternative

Era noun - An extent of time associated with a particular person or thing.

Aeon is a synonym for era in age topic. You can use "Aeon" instead a noun "Era", if it concerns topics such as epoch, time period in history. popular alternative