Auxiliary and Backup

Similar meaning words

Auxiliary adjective - Available to supply something extra when needed.

Usage example: the auditorium has an auxiliary cooling system used only on particularly sweltering days

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Backup is a synonym for auxiliary in increase topic. In some cases you can use "Backup" instead the word "Auxiliary" as an adjective or a noun, when it comes to topics like supplementary, additional.

Backup noun - A crowded mass (as of cars) that impedes or blocks movement.

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Auxiliary is a synonym for backup in increase topic. You can use "Auxiliary" instead the word "Backup" as an adjective or a noun.

Nearby Word: backing

human auxiliary

human backup

Luckily, they were prepared enough to have an emergency backup through auxiliary power ... by a pedal-powered generator.

Source: Manga / Shinryaku! Ika Musume
For example, the Amateur Radio Emergency Service and the Military Auxiliary Radio Service both serve to provide government agencies with additional/backup communications support when needed.

Source: Home Guard
Department of Redundancy Department: "We keep this TOP CLASSIFIED SECRET." "And there wasn't time to go to the auxiliary backup system." "Die Hard" on an X: Die Hard on a Spaceship, in this case.

Source: Film / Space Mutiny

Cite this Source

Backup and Auxiliary. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/auxiliary/backup

Auxiliary & Backup. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/auxiliary/backup>.

Backup or Auxiliary. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/auxiliary/backup.

Google Ngram Viewer shows how "auxiliary" and "backup" have occurred on timeline