Foreign Affairs

Ex-pat. Informal. Short for expatriate. 1. Resident in a foreign country 2. Exiled or banished from one's native country.
Migrant - 1. A person or animal that moves from one region, place or country to another 2. An itinreant agricultural worker who travels from one district to another
Refugee - a person who has fled from some danger or problem, esp. political persecution
Collins Softback English Dictionary.

As an ex-pat language worker I find it interesting that the Collins Dictionary does not capture the subtle difference in emphasis that exists between ex-pat and migrant. Ex-pat generally implies departing one's home country with sufficient resources, whereas a migrant (and of course an economic refugee) implies the search for resources. It is even more interesting to note that a refugee can be used to describe as someone fleeing a problem. Something that is often true of many ex-pats and migrants - even if they don't realise it.
Tom Waits once sung

Most vagabonds I knowed don’t ever want to find the culprit

That remains the object of their long relentless quest

The obsession’s in the chasing and not the apprehending

The pursuit you see and never the arrest.

But sooner or later our realities catch up with us - for good or ill and it''s then, rather than the moment you first step off the boat, plane or whatever and start to immerse yourself in a new country that life gets interesting..