idealization has 2 distinct synonyms spread across 3 of its 3 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
a portrayal of something as ideal
“the idealization of rural life was very misleading”
(psychiatry) a defense mechanism that splits something you are ambivalent about into two representations--one good and one bad
Synonyms, antonyms and the broader and narrower relations for idealization come from Princeton University’s WordNet. Full sources and licences.
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.