extra
ex-tra
noun
An item or amount added to something, often for an additional charge.
"The car came with several optional extras."
noun
A person hired for a non-speaking role in a film or play.
"They needed many extras for the crowd scene."
adjective
Added to what is usual or expected; more than necessary or standard.
"Do you need an extra blanket?"
Thesaurus
Synonyms: spear carrier, supernumerary, additive, additional, redundant, spare, unnecessary, excess, surplus, supererogatory, unneeded, superfluous