I removed that sentence/claim, I see the point that "boiling" and "raging" was a bad example.

Cool, going back over them I'm actually surprised at the strength of the substitution test, thus far I haven't really encountered one that strongly goes against the test if a suitable synonym is picked.

There are a few things for which English simply doesn't have anything to substitute and those are harder to assess. boiling is one but so would "blood" in "blood pressure", obviously replacing it with another liquid has basically the same meaning eg water pressure, oil pressure but as far as I can tell there's literally no synonym for blood.

I those cases I try to use a stand in from another language to see of the substitution works. for for example "sangre" in Spanish so "sangre pressure" which doesn't seem to affect it's meaning much so I'd argue it's exclusion.

Conversely "Red tape" cannot be "roja tape" and a "caliente dog" is one trapped in a car not a food.