Naturalization is the process of becoming a citizen of a foreign country. But what if you want to use a synonym for this word? Naturalizings is a fairly uncommon derivative, so it's best to focus on the original word. Some synonyms for naturalization include citizenship, immigration, adaptation, assimilation, and incorporation. Each of these words has a slightly different connotation. Citizenship and immigration both refer to the process of becoming a legal member of a country. Adaptation and assimilation suggest a process of adjusting to a new culture and way of life. Incorporation refers to the act of integrating into a new community or organization. Whatever word you choose, remember that the concept of naturalization is one of transformation and adjustment.