prodigy has 5 distinct synonyms spread across 1 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.
an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration
“she is a chess prodigy”
a sign of something about to happen
“he looked for an omen before going into battle”
an impressive or wonderful example of a particular quality
“the Marines are expected to perform prodigies of valor”
Synonyms, antonyms and the broader and narrower relations for prodigy come from Princeton University’s WordNet. Full sources and licences.