Not compulsory
Optional and not compulsory are semantically related. in able to be chosen topic. In some cases you can use "Optional" instead an adjective phrase "Not compulsory".
Optional
Optional adjective - Subject to one's freedom of choice.
Not compulsory and optional are semantically related. You can use "Not compulsory" instead an adjective "Optional".
Nearby Words: option, optionally
Mutual synonyms
Cite this Source
Optional and Not compulsory. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/not_compulsory/optional
Not compulsory & Optional. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/not_compulsory/optional>.
Optional or Not compulsory. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/not_compulsory/optional.
Google Ngram Viewer shows how "not compulsory" and "optional" have occurred on timeline