naturalize has 4 distinct synonyms spread across 4 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is denaturalize.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
make into a citizen
“The French family was naturalized last year”
explain with reference to nature
Synonyms, antonyms and the broader and narrower relations for naturalize come from Princeton University’s WordNet. Full sources and licences.
adopt to another place
“The stories had become naturalized into an American setting”