[kgwgk]

    > Got a word           Didn’t
    > frozen water → ice   boiling water

Freezing water doesn’t have a word. Boiled water does have a word.

[pvillano]

A mixture of melting ice and water suitable for drinking has a word: ice water. It's not a adjective noun phrase. It has a more specific meaning than just the two words together. You can order an ice water at a restaurant

[hagbard_c]

Freezing water doesn't have a word, it only gets one after water has changed phase. Boiling water also gets a word once it has changed phase: steam.

ice - water - steam

[dragonwriter]

Steam is liquid water droplets suspended in gas; water in the gas phase is “water vapor” which also doesn't have a single word.

This is also an interesting case because “vapor” without a qualifier also refers to a suspension of solid or liquid particles in gas (of which “steam” is a particular example).

[kgwgk]

Right. (I’m not sure if you’re aware but that’s exactly what I said.)