Wiktionary
economic migrant
n. A person who migrates for economic reasons
Wikipedia
Economic migrant
An economic migrant is someone who emigrates from one region to another to seek an improvement in living standards because the living conditions or job opportunities in the migrant's own region are not good. The United Nations uses the term migrant worker. The term economic migrant is often confused with the term refugee, but economic migrants leave their country due to bad economic conditions, not due to fear of persecution on the basis of race, religion, or ethnicity.