I'm sure I've brought this up before but I can't find the details now so here it is laid out:
We currently have a currency tag.
It has the synonym money.
But the concept of "currency" is more specific than the concept of money.
"Currency" generally means cash money or money of a specific country whereas "money" is a general term covering all forms of money.
Now generally a general term is a better "lead tag" or "head tag" of a group of synonyms than a specific term but let's examine this case. Maybe it's better to split the tag and use both?
As it turns out most questions tagged "currency/money" are general. There are a few about which of several possible currencies are more suitable in specific situations but not enough in my opinion to warrant a separate tag, and there are enough varied questions that the general term "money" maps better as a tag with our current questions than the specific term "currency".
What does the rest of the community think?
Well a surprising result for me! Now what should we do with the tag wiki which seems overly specific if it's to cover "money" as well as "currency"?
tag wiki excerpt
Coins and banknotes issued from a government as a generally accepted medium of exchange.
Coins and banknotes issued from a government or supranational organization as a generally accepted medium of exchange. Some examples are the US dollar (USD), euro (EUR) or Japanese Yen (JPY).
Questions tagged currency relate to questions of obtaining, using and exchanging a particular currency in a particular country or region, and both electronic and cash transactions are covered.