relativity theory vs Einstein's theory of relativity

relativity theory and Einstein's theory of relativity both are nouns.

Word	Noun	Adjective	Verb	Adverb
relativity theory	Yes	No	No	No
Einstein's theory of relativity	Yes	No	No	No

As nouns, relativity theory and Einstein's theory of relativity are synonyms defined as:

relativity theory and Einstein's theory of relativity: (physics) the theory that space and time are relative concepts rather than absolute concepts

Other synonyms of relativity theory include relativity, theory of relativity.

relativity theory (noun)	Einstein's theory of relativity (noun)
(physics) the theory that space and time are relative concepts rather than absolute concepts	(physics) the theory that space and time are relative concepts rather than absolute concepts