great depression has 1 distinct synonym 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. 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.
the economic crisis beginning with the stock market crash in 1929 and continuing through the 1930s
a period during the 1930s when there was a worldwide economic depression and mass unemployment
Synonyms, antonyms and the broader and narrower relations for great depression come from Princeton University’s WordNet. Full sources and licences.