* Emigrant: This refers to someone who leaves their country to live in another.
* Native: This refers to someone born in a particular place or country.
* Citizen: This refers to someone who has legal rights and protections in a particular country.
* Expatriate: This refers to someone who lives outside of their home country, often for work.
The best antonym for "immigrant" will depend on the specific meaning you are trying to convey.