Noncompulsory
Open and noncompulsory are semantically related. in possible topic. In some cases you can use "Open" instead an adjective "Noncompulsory".
Open
Open adjective - Allowing passage without obstruction.
Noncompulsory and open are semantically related. You can use "Noncompulsory" instead an adjective "Open".
Mutual synonyms
Cite this Source
Open and Noncompulsory. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/noncompulsory/open
Noncompulsory & Open. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/noncompulsory/open>.
Open or Noncompulsory. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/noncompulsory/open.
Google Ngram Viewer shows how "noncompulsory" and "open" have occurred on timeline