Extra
Extra noun - An interchangeable part or piece of equipment that is kept on hand for replacement of an original.
Residuum
Residuum noun - A remaining group or portion.
Extra and residuum are semantically related in leftover part topic. Sometimes you can use "Extra" instead a noun "Residuum".
Cite this Source
Residuum and Extra. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/extra/residuum
Extra & Residuum. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/extra/residuum>.
Residuum or Extra. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/extra/residuum.
Google Ngram Viewer shows how "extra" and "residuum" have occurred on timeline