scramble has 12 distinct synonyms spread across 5 of its 7 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 unscramble.
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.
to move hurriedly
“The friend scrambled after them”
make unintelligible
“scramble the message so that nobody can understand it”
Synonyms, antonyms and the broader and narrower relations for scramble come from Princeton University’s WordNet. Full sources and licences.