phase change vs state change

phase change and state change both are nouns.

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

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

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

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

phase change (noun)	state 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