confusion 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
disorder resulting from a failure to behave predictably
“the army retreated in confusion”
a mental state characterized by a lack of clear and orderly thought and behavior
“a confusion of impressions”
a feeling of embarrassment that leaves you confused
an act causing a disorderly combination of elements with identities lost and distinctions blended
“the confusion of tongues at the Tower of Babel”
Synonyms, antonyms and the broader and narrower relations for confusion come from Princeton University’s WordNet. Full sources and licences.