General synonyms:
* Movement: This is a very general term, but it can encompass migration if the movement is from one place to another.
* Relocation: This implies a more permanent change of residence.
* Transmigration: This specifically refers to the movement of a soul after death.
* Exodus: This refers to a mass departure of people from a place, often due to persecution or disaster.
* Emigration: This refers to the act of leaving one's country to live in another.
* Immigration: This refers to the act of entering and living in a new country.
Synonyms related to specific types of migration:
* Flight: This refers to a sudden, panicked movement of people or animals.
* Dispersal: This refers to the spreading out of people or animals over a wider area.
* Seeding: This refers to the movement of people to new areas to start new settlements.
* Dispersion: This refers to the scattering of people or animals from a central location.
The best synonym to use will depend on the specific context of the sentence.