Extra and Pantomimist

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

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

Pantomimist noun - An actor in a story performed silently and entirely by body movements.

Extra and pantomimist are semantically related in person who performs topic. Sometimes you can use "Extra" instead a noun "Pantomimist".