Ancillaries refer to the supplementary or secondary items that are essential for the primary things. It includes everything from spare keys to additional tools or accessories. Synonyms for ancillaries include add-ons, attachments, adjuncts, appurtenances, gadgets, accouterments, peripherals, fixtures, components, and extras. These items complement the primary object and make it function better. Ancillaries are often essential for larger projects, and they can be a critical part of any operation or system. By understanding the synonyms of ancillaries, you can broaden your vocabulary and convey your message more effectively when discussing secondary items or components in any context.