conservation of mass vs conservation of matter

conservation of mass and conservation of matter both are nouns.

Word	Noun	Adjective	Verb	Adverb
conservation of mass	Yes	No	No	No
conservation of matter	Yes	No	No	No

As nouns, conservation of mass and conservation of matter are synonyms defined as:

conservation of mass and conservation of matter: a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system

Other synonyms of conservation of mass include law of conservation of mass, law of conservation of matter.

conservation of mass (noun)	conservation of matter (noun)
a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system	a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system