federal reserve system has 3 distinct synonyms spread across 1 of its 1 sense. 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 central bank of the United States; incorporates 12 Federal Reserve branch banks and all national banks and state-chartered commercial banks and some trust companies
“the Fed seeks to control the United States economy by raising and lowering short-term interest rates and the money supply”
Synonyms, antonyms and the broader and narrower relations for federal reserve system come from Princeton University’s WordNet. Full sources and licences.