WordNet records no synonym and no antonym for election. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 vote to select the winner of a position or political office
“the results of the election will be announced tonight”
the act of selecting someone or something; the exercise of deliberate choice
“her election of medicine as a profession”
the status or fact of being elected
“they celebrated his election”
the predestination of some individuals as objects of divine mercy (especially as conceived by Calvinists)
Synonyms, antonyms and the broader and narrower relations for election come from Princeton University’s WordNet. Full sources and licences.