IDK, I would use "immigrant" when someone moves to another country with the intent to stay there, and "expat" when someone moves to another country for work or

IDK, I would use "immigrant" when someone moves to another country with the intent to stay there, and "expat" when someone moves to another country for work or study (so, longer than just tourism) but while they might choose to stay/immigrate, for now that's just temporary, say, for a year or two.