Aux
Extra
Extra noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.
Mutual synonyms
Cite this Source
Extra and Aux. (2017). Retrieved 2026, August 02, from https://thesaurus.plus/related/aux/extra
Aux & Extra. N.p., 2017. Web. 02 Aug. 2026. <https://thesaurus.plus/related/aux/extra>.
Extra or Aux. 2017. Accessed August 02, 2026. https://thesaurus.plus/related/aux/extra.
Google Ngram Viewer shows how "aux" and "extra" have occurred on timeline