bank has 18 distinct synonyms spread across 6 of its 18 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.
a financial institution that accepts deposits and channels the money into lending activities
“he cashed a check at the bank”
an arrangement of similar objects in a row or in tiers
“he operated a bank of switches”
a supply or stock held in reserve for future use (especially in emergencies)
the funds held by a gambling house or the dealer in some gambling games
“he tried to break the bank at Monte Carlo”
a container (usually with a slot in the top) for keeping money at home
“the coin bank was empty”
a building in which the business of banking transacted
“the bank is on the corner of Nassau and Witherspoon”
a flight maneuver; aircraft tips laterally about its longitudinal axis (especially in turning)
“the plane went into a steep bank”
tip laterally
“the pilot had to bank the aircraft”
do business with a bank or keep an account at a bank
“Where do you bank in this town?”
act as the banker in a game or in gambling
cover with ashes so to control the rate of burning
“bank a fire”
Synonyms, antonyms and the broader and narrower relations for bank come from Princeton University’s WordNet. Full sources and licences.