Einstein's theory of relativity vs theory of relativity

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

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

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

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

Other synonyms of Einstein's theory of relativity include relativity, relativity theory.

Einstein's theory of relativity (noun)	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