czech has 2 distinct synonyms spread across 2 of its 4 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
a native of inhabitant of the Czech Republic
a native or inhabitant of the former republic of Czechoslovakia
Synonyms, antonyms and the broader and narrower relations for czech come from Princeton University’s WordNet. Full sources and licences.
of or relating to Czechoslovakia or its people or their language
“The Czech border”