extra - noun

a minor actor in crowd scenes

an additional edition of a newspaper (usually to report a crisis)

something additional of the same kind

extra - adjective

• more than is needed, desired, or required
• added to a regular schedule
• further or added

extra - adverb

• unusually or exceptionally

extra - thesaurus

additional   duplicate   excess   redundant   spare   special   supererogatory   superfluous   supernumerary   surplus