Annex
Annex noun - A smaller structure added to a main building.
Extensions and annex are semantically related In some cases you can replace term "Extensions" with "Annex", this nouns are similar.
Extensions
Annex and extensions are semantically related in enlargement topic. Sometimes you can use "Annex" instead a noun "Extensions".
Mutual synonyms
Cite this Source
Extensions and Annex. (2016). Retrieved 2026, August 12, from https://thesaurus.plus/related/annex/extensions
Annex & Extensions. N.p., 2016. Web. 12 Aug. 2026. <https://thesaurus.plus/related/annex/extensions>.
Extensions or Annex. 2016. Accessed August 12, 2026. https://thesaurus.plus/related/annex/extensions.
Google Ngram Viewer shows how "annex" and "extensions" have occurred on timeline