n. 25B6; noun
camera accessories such as tripods and flashguns : ATTACHMENT, extra, addition, add-on, adjunct, appendage, appurtenance, fitment, supplement.
fashion accessories : ADORNMENT, embellishment, ornament, ornamentation, decoration; frills, trimmings.
she was charged as an accessory to murder : ACCOMPLICE, partner in crime, associate, collaborator, fellow conspirator; henchman.
25B6; adjective an accessory gearbox : ADDITIONAL, extra, supplementary, supplemental, auxiliary, ancillary, secondary, subsidiary, reserve, add-on.