verb (used without object), nat·u·ral·ized, nat·u·ral·iz·ing. to become naturalized. to adapt as if native to a new environment, set of circumstances, etc. to study or carry on research in natural history.

Is naturalize an adjective?

NATURALIZED (adjective) definition and synonyms | Macmillan Dictionary.

What is the noun of Naturalisation?

/ˌnætʃrələˈzeɪʃn/ (British English also naturalisation) [uncountable] ​the process of making somebody who was not born in a particular country a citizen of that country.