supernumerary in WordNet English dictionary

1. more than is needed, desired, or required
   "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"
   excess  extra  redundant  spare  supererogatory  superfluous  supernumerary  surplus 
   

1. a minor actor in crowd scenes
   supernumerary  spear carrier  extra 
   
2. a person serving no apparent function
   "reducing staff is difficult because our employees include no supernumeraries"
   supernumerary