superiority has 5 distinct synonyms spread across 3 of its 4 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 inferiority.
the quality of being superior
Synonyms, antonyms and the broader and narrower relations for superiority 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.
the quality of being at a competitive advantage
displaying a sense of being better than others
“he hated the white man's superiority and condescension”
the state of excelling or surpassing or going beyond usual limits