vac (noun): coin (especially silver); unit of currency.
arcá minaram vac-ur-tuleval cá-púsamacúmbangut
indeed give.PERF.1.TRANS coin-GEN-ten.ACC this-horse.lame
“[I] paid ten silver coins for this lame horse!”
vac is most often used either explicitly for coins made of silver, or with the general meaning of any coin being used in monetary transactions, even if it is made of some other metal. By comparison, the noun hámas ‘golden; gold coin’ is only ever used for golden coins, and it implies more of an opulent display of money or wealth than a unit of currency. Thus, saying that a person used hámas in paying for something conveys the meaning of them flaunting their wealth, or being ostentatious about their ability to pay a large sum of cash; while vac is a much more neutral term, with no such implications.