WordNet records no synonym and no antonym for capital account. 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.
(economics) that part of the balance of payments recording a nation's outflow and inflow of financial securities
(finance) an account of the net value of a business at a specified date
Synonyms, antonyms and the broader and narrower relations for capital account come from Princeton University’s WordNet. Full sources and licences.