mummify has 1 distinct synonym 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.
preserve while making lifeless
“mummified ideas and institutions should be gotten rid of”
remove the organs and dry out (a dead body) in order to preserve it
“Th Egyptians mummified their pharaohs”
Synonyms, antonyms and the broader and narrower relations for mummify come from Princeton University’s WordNet. Full sources and licences.