sophistication has 6 distinct synonyms spread across 3 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 naivete.
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.
Synonyms, antonyms and the broader and narrower relations for sophistication come from Princeton University’s WordNet. Full sources and licences.
being expert or having knowledge of some technical subject
“understanding affine transformations requires considerable mathematical sophistication”
the quality or character of being intellectually sophisticated and worldly through cultivation or experience or disillusionment
falsification by the use of sophistry; misleading by means of specious fallacies
“he practiced the art of sophistication upon reason”