liquefaction vs phase change

liquefaction and phase change both are nouns.

Word	Noun	Adjective	Verb	Adverb
liquefaction	Yes	No	No	No
phase change	Yes	No	No	No

As nouns, phase change is a hypernym of liquefaction; that is, phase change is a word with a broader meaning than liquefaction:

liquefaction: the conversion of a solid or a gas into a liquid
phase change: a change from one state (solid or liquid or gas) to another without a change in chemical composition

Other hypernyms of liquefaction include phase transition, physical change, state change.

liquefaction (noun)	phase change (noun)
the conversion of a solid or a gas into a liquid	a change from one state (solid or liquid or gas) to another without a change in chemical composition