Extension
Extension noun - The act of making longer.
Supplementary part and extension are semantically related. In some cases you can use "Supplementary part" instead a noun "Extension".
Supplementary part
Extension and supplementary part are semantically related. You can use "Extension" instead a noun phrase "Supplementary part".
Mutual synonyms
Cite this Source
Supplementary part and Extension. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/extension/supplementary_part
Extension & Supplementary part. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/extension/supplementary_part>.
Supplementary part or Extension. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/extension/supplementary_part.
Google Ngram Viewer shows how "extension" and "supplementary part" have occurred on timeline