supernumerary, spear carrier, extra(noun)

a minor actor in crowd scenes

Synonyms:
spear carrier, duplicate, extra, supernumerary

Antonyms:
subtractive, scheduled, necessary

extra(noun)

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

Synonyms:
spear carrier, duplicate, supernumerary

Antonyms:
necessary, subtractive, scheduled

extra, duplicate(adj)

something additional of the same kind

Synonyms:
duplication, spear carrier, duplicate, extra, supernumerary

Antonyms:
necessary, scheduled, subtractive

excess, extra, redundant, spare, supererogatory, superfluous, supernumerary, surplus(adj)

more than is needed, desired, or required

Synonyms:
superfluous, senseless, surplus, unembellished, supererogatory, scanty, spare, otiose, wasted, pleonastic, unornamented, extra, free, plain, redundant, supernumerary, excess, purposeless, additional, tautological, special, tautologic, trim, bare(a), bare, pointless

Antonyms:
necessary, subtractive, scheduled

extra, special(adj)

added to a regular schedule

Synonyms:
superfluous, surplus, special(a), peculiar(a), excess, spare, extra, supererogatory, redundant, supernumerary, limited, particular, additional, special, especial(a), particular(a), exceptional

Antonyms:
scheduled, subtractive, necessary

extra, additional(adverb)

further or added

Synonyms:
excess, supererogatory, superfluous, surplus, spare, supernumerary, special, additional, extra, redundant

Antonyms:
necessary, scheduled, subtractive

extra(adverb)

unusually or exceptionally

Antonyms:
subtractive, necessary, scheduled