disorder has 9 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 order.
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.
a physical condition in which there is a disturbance of normal functioning
“the doctor prescribed some medicine for the disorder”
a condition in which things are not in their expected places
“the files are in complete disorder”
a disturbance of the peace or of public order
Synonyms, antonyms and the broader and narrower relations for disorder come from Princeton University’s WordNet. Full sources and licences.