antitype has no recorded synonym. 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. Its one recorded opposite is type.
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 person or thing represented or foreshadowed by an earlier type or symbol; especially a figure or event in the New Testament having a counterpart in the Old Testament
“Aaron and Jesus Christ are the type and antitype for the high priest who made atonement for the sins of the people”
Synonyms, antonyms and the broader and narrower relations for antitype come from Princeton University’s WordNet. Full sources and licences.