Capital
Capital adjective - Coming before all others in importance.
Upper-case and capital are semantically related. In some cases you can use "Upper-case" instead an adjective "Capital".
Upper-case
Capital and upper-case are semantically related. You can use "Capital" instead a noun phrase "Upper-case".
Mutual synonyms
Both words in one sentence
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The most plausible explanation is that for a period in early modern written English, there was no proper upper-case F, and so the lower-case f was written twice in situations such as names where it had to be clear that the capital was intended.
Source: Spell My Name with an "S"
Cite this Source
Upper-case and Capital. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/capital/upper-case
Capital & Upper-case. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/capital/upper-case>.
Upper-case or Capital. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/capital/upper-case.