purge has 20 distinct synonyms spread across 5 of its 10 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. Its one recorded opposite is rehabilitate.
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.
oust politically
“Deng Xiao Ping was purged several times throughout his lifetime”
make pure or free from sin or guilt
“he left the monastery purified”
excrete or evacuate (someone's bowels or body)
“The doctor decided that the patient must be purged”
the act of clearing yourself (or another) from some stigma or charge
an act of removing by cleansing; ridding of sediment or other undesired elements
Synonyms, antonyms and the broader and narrower relations for purge come from Princeton University’s WordNet. Full sources and licences.
an abrupt or sudden removal of a person or group from an organization or place
“he died in a purge by Stalin”