expatriate has 3 distinct synonyms spread across 2 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. Its one recorded opposite is repatriate.
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.
expel from a country
“The poet was exiled because he signed a letter protesting the government's actions”
move away from one's native country and adopt a new residence abroad
a person who is voluntarily absent from home or country
“American expatriates”
Synonyms, antonyms and the broader and narrower relations for expatriate come from Princeton University’s WordNet. Full sources and licences.