Extra and Playactor

Extra noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.

Playactor and extra are semantically related In some cases you can use "Playactor" instead a noun "Extra".

Playactor noun - An actor who travels around the country presenting plays.

Extra and playactor are semantically related in actor topic. Sometimes you can use "Extra" instead a noun "Playactor", if it concerns topics such as person who performs, person who acts in performance.