relativity theory vs relativity

relativity theory and relativity both are nouns.

Word	Noun	Adjective	Verb	Adverb
relativity theory	Yes	No	No	No
relativity	Yes	No	No	No

As nouns, relativity theory and relativity are synonyms defined as:

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

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

relativity theory (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