When I grow up, I want to be ... this category also includes some things that aren't quite jobs but are definitely vocations. Such as being a wizard or vampire.
An accountant is someone whose job is to manage other people's professional finances. Accountants will help in getting records into the correct format to transfer them to places like the the taxation department.
An acrobat, sometimes called an aerialist, is someone who does activities like juggling, tumbling, tightrope-walking and other gymnastics. Today, acrobats are usually seen at a circus. Before television, travelling acrobats would visit towns and castles to perform for the people's entertainment.
An actor is someone who plays pretend for a living. Actors put on plays on stage, or are in movies or television shows pretending to be someone else or someone made up. Their job is to entertain people. Sometimes a female actor is called an actress.
An archaeologist is someone who studies cultures and societies that no longer exist, by examining what they have left behind. Where a city or other settlement used to be, there will be lots of things still there after the people have moved on, such as the remains of pottery, weapons, houses and of course the bones of the people themselves.
An astronaut or cosmonaut is someone who goes above the Earth into space on a spaceship. Astronauts sometimes visit the moon, and perhaps in the future they will visit other planets too.
