A Person who leaves his/her own country to settle permanently in another country is called a/an-

• A person who leaves his/her own country to settle permanently in another is called an emigrant.

• Emigrant (Noun, Adjective)
- English Meaning: A person who leaves his/her own country to settle permanently in another country.
- Bangla Meaning: স্বদেশত্যাগী; বাস্তুত্যাগী বা দেশান্তরী (ব্যক্তি)।

অন্যদিকে,
• Immigrant (Noun):
- English Meaning: A person who comes to a country to take up permanent residence.
- Bangla Meaning: বহিরাগত; অভিবাসী; বসবাসের জন্য বিদেশে আগমনকারী।

• Expatriate (Noun, verb, adjective):
- English Meaning: A person who lives in a foreign country.
- Bangla Meaning: প্রবাসী ব্যক্তি।

• Migrant (Noun):
- English Meaning: A person who moves from one place to another, especially in order to find work or better living conditions; a bird or animal that migrates.
- Bangla Meaning: বসবাসের উদ্দেশ্যে এক স্থান ত্যাগ করে অন্যত্র গমনকারী (বিশেষত পাখি)।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Merriam-Webster Dictionary.