connecticut has 5 distinct synonyms spread across 2 of its 3 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 New England state; one of the original 13 colonies
a river in the northeastern United States; flows south from northern New Hampshire along the border between New Hampshire and Vermont and through Massachusetts and Connecticut where it empties into Long Island Sound
one of the British colonies that formed the United States
Synonyms, antonyms and the broader and narrower relations for connecticut come from Princeton University’s WordNet. Full sources and licences.