manifest has 10 distinct synonyms spread across 2 of its 5 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.
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
“His high fever attested to his illness”
record in a ship's manifest
“each passenger must be manifested”
reveal its presence or make an appearance
“the ghost manifests each year on the same day”
a customs document listing the contents put on a ship or plane
Synonyms, antonyms and the broader and narrower relations for manifest come from Princeton University’s WordNet. Full sources and licences.