What is the main difference between a commodity and a currency? Consumption! A currency circulates through the economy as a medium of exchange but is not consumed. A commodity is a useful basic economic good that is produced, traded in common units and prices all over the world, and then consumed by industry or individuals.
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And what is the difference between a currency and a wealth asset? Time and appreciation! The main difference is the amount of time that each is held. A currency is earned and spent in a short timeframe and wealth assets are accumulated and held for longer timeframes. Here is a list of some common wealth assets:
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What separates "endurable wealth assets" from the rest of the physical world of consumer goods is their tendency to appreciate against the currency.