> Then how about "wealth"

I explicitly stated that as an alternative, so I'm not sure why you would ask that in response.

> I wouldn't call a tank "treasure".

Since treasure refers to a collection of valuable objects, and a tank, as such, is generally a valuable object, that's true -- one wouldn't usually refer to a tank (or a gold coin, etc.) as "treasure", though one might validly refer to a collection of things that included, among other things, one or more tanks that way.

I asked the question because you proposed "wealth" as equivalent to "treasure", while I'm proposing it exclusive to "treasure".

The historical uses linked in a sibling comment seem to be pretty clear that it's used as a synonym for "money".