state change vs phase change

state change and phase change both are nouns.

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

As nouns, state change and phase change are synonyms defined as:

state change and phase change: a change from one state (solid or liquid or gas) to another without a change in chemical composition

Other synonyms of state change include phase transition, physical change.

state change (noun)	phase change (noun)
a change from one state (solid or liquid or gas) to another without a change in chemical composition	a change from one state (solid or liquid or gas) to another without a change in chemical composition