jonah has 2 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.
(Old Testament) Jonah did not wish to become a prophet so God caused a great storm to throw him overboard from a ship; he was saved by being swallowed by a whale that vomited him out onto dry land
a book in the Old Testament that tells the story of Jonah and the whale
Synonyms, antonyms and the broader and narrower relations for jonah come from Princeton University’s WordNet. Full sources and licences.