Optional
Optional adjective - Subject to one's freedom of choice.
Supplementary and optional are semantically related in further topic. In some cases you can use "Supplementary" instead an adjective "Optional", when it comes to topics like other.
Nearby Words: option, optionally
Supplementary
Supplementary adjective - Available to supply something extra when needed.
Optional and supplementary are semantically related in further topic. Sometimes you can use "Optional" instead an adjective "Supplementary", if it concerns topics such as other.
Mutual synonyms
Related pairs
- reserve and optional
- reserve and supplementary
- surplus and optional
- surplus and supplementary
- unessential and optional
- unessential and supplementary
- nonessential and optional
- nonessential and supplementary
- spare and optional
- spare and supplementary
- alternative and optional
- alternative and supplementary
- unnecessary and optional
- unnecessary and supplementary
Both words in one sentence
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Ostensibly they're just supplementary reading, but there's no such thing as "optional," is there?
Cite this Source
Supplementary and Optional. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/optional/supplementary
Optional & Supplementary. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/optional/supplementary>.
Supplementary or Optional. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/optional/supplementary.
Google Ngram Viewer shows how "optional" and "supplementary" have occurred on timeline