silver: the precious metal, and the money and coins made from it
The word names silver, the precious white metal, and everything valuable that is made from it. Because silver was the ordinary medium of exchange in the ancient world, the same word slides naturally from the metal itself, to money in general, to a single coin. Which shade is in view is settled by the context, not by the word.
Sometimes it is raw silver set beside gold as a picture of wealth or costliness, as when Peter says he has no silver or gold to give (Acts 3:6) or reminds his readers they were not redeemed with silver and gold (1 Peter 1:18). More often it is simply money: funds a person keeps, lends, entrusts to a servant, or hands over as a bribe. In the plural it can mean individual coins, most famously the thirty silver pieces paid to betray Jesus.
The metal itself is ἄργυρος, and this word is its close relative, leaning toward silver as currency; its constant partner in the wealth pairing is gold, χρυσίον. The Hebrew word that behaves almost identically, covering both the metal and money, is כֶּסֶף.