minister has 7 distinct synonyms spread across 3 of its 6 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 person authorized to conduct religious worship
“clergymen are usually called ministers in Protestant churches”
a person appointed to a high office in the government
“Minister of Finance”
a diplomat representing one government to another; ranks below ambassador
the job of a head of a government department
Synonyms, antonyms and the broader and narrower relations for minister come from Princeton University’s WordNet. Full sources and licences.