elizabeth ii has 1 distinct synonym 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.
daughter of George VI who became the Queen of England and Northern Ireland in 1952 on the death of her father (1926-)
“Elizabeth II is the head of state in Great Britain”
Synonyms, antonyms and the broader and narrower relations for elizabeth ii come from Princeton University’s WordNet. Full sources and licences.