relativity vs Einstein's theory of relativity

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

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

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

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

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

relativity (noun)	Einstein's theory of relativity (noun)
the quality of being relative and having significance only in relation to something else	(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