supernumerary
su-per-nu-mer-a-ry
adjective
Exceeding the usual or necessary number; extra or surplus to requirements.
"They hired a supernumerary assistant for the project."
noun
An extra person or thing, especially an actor in a crowd scene.
"She worked as a supernumerary in the opera production."
Thesaurus
Synonyms: extra, spear carrier, redundant, spare, unnecessary, excess, surplus, supererogatory, unneeded, superfluous