Amateur and Headliner

Amateur noun - A person who regularly or occasionally engages in an activity as a pastime rather than as a profession.

Headliner and amateur are semantically related In some cases you can use "Headliner" instead a noun "Amateur".

Headliner noun - The person who has the most important role in a play, movie, or TV show.

Amateur and headliner are semantically related in person who performs topic. Sometimes you can use "Amateur" instead a noun "Headliner".