> “Boiling water” isn’t “water that happens to be boiling.” It’s a hazard, a cooking stage, a state of matter I guess we'll have to disagree then, because "boiling water" is "water that's boiling" to me. It's not a different state of matter to "water", that would be "steam". It being a hazard doesn't mean it's a singular concept, same as "wet floor"
- Don't put your hand in water that's boiling,
- Add the pasta to water that's boiling,
- That saucepan is full of water that's boiling.
If "boiling water" were a distinct word, all of these sentences would change meaning compare to their idiomatic counterparts.