Freezing describes the process of a liquid turning into a solid as it loses heat energy.
Simple: a transformation from a solid to a liquid.
Without the terms, it's difficult to be sure what is needed, but the usual term is sublimation.
When a solid does not dissolve into a liquid, it is referred to as insoluble. This means that the solid remains in its original form and does not mix evenly with the liquid.
Liquid.
Melting is the term used when a solid is turned into a liquid by increasing its temperature.
Freezing
gas
Simple: a transformation from a solid to a liquid.
freezing
The term is fusion (lay term is freezing).
Sublimation best describes the process in which a solid directly changes to a gas without passing through the liquid state.
Sublimation, I think.Sublimation.
The physical property that describes the temperature at which a solid becomes a liquid is called the melting point. It is the temperature at which the solid and liquid phases of a substance coexist in equilibrium.
In this case the entropy increase.
Solidification
The term that means all the liquid and solid water on Earth is "hydrosphere."
Without the terms, it's difficult to be sure what is needed, but the usual term is sublimation.