ascendance has 5 distinct synonyms spread across 1 of its 1 sense. 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.
the state that exists when one person or group has power over another
“her apparent dominance of her husband was really her attempt to make him pay attention to her”
Synonyms, antonyms and the broader and narrower relations for ascendance come from Princeton University’s WordNet. Full sources and licences.