chemical action vs chemical change

chemical action and chemical change both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical action	Yes	No	No	No
chemical change	Yes	No	No	No

As nouns, chemical action and chemical change are synonyms defined as:

chemical action and chemical change: (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

Other synonyms of chemical action include chemical process.

chemical action (noun)	chemical change (noun)
(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved	(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved