Einstein's theory of relativity vs relativity

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

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

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

Einstein's theory of relativity and 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 theory, theory of relativity.

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