WordNet records no synonym and no antonym for consolidate. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
unite into one
“The companies consolidated”
make firm or secure; strengthen
“consolidate one's gains”
bring together into a single whole or system
Synonyms, antonyms and the broader and narrower relations for consolidate come from Princeton University’s WordNet. Full sources and licences.
“The town and county schools are being consolidated”
form into a solid mass or whole
“The mud had consolidated overnight”
make or form into a solid or hardened mass
“consolidate fibers into boards”