fund has 6 distinct synonyms spread across 3 of its 9 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.
convert (short-term floating debt) into long-term debt that bears fixed interest and is represented by bonds
place or store up in a fund for accumulation
provide a fund for the redemption of principal or payment of interest
Synonyms, antonyms and the broader and narrower relations for fund come from Princeton University’s WordNet. Full sources and licences.
invest money in government securities
accumulate a fund for the discharge of a recurrent liability
“fund a medical care plan”
a reserve of money set aside for some purpose
a supply of something available for future use
“he brought back a large store of Cuban cigars”
a financial institution that sells shares to individuals and invests in securities issued by other companies