uppercase has 4 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is lowercase.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis
“printers once kept the type for capitals and for small letters in separate cases; capitals were kept in the upper half of the type case and so became known as upper-case letters”
Synonyms, antonyms and the broader and narrower relations for uppercase come from Princeton University’s WordNet. Full sources and licences.
relating to capital letters which were kept in the top half of a compositor's type case
“uppercase letters; X and Y and Z etc”