Einstein's general theory of relativity vs general relativity

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

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

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

Einstein's general theory of relativity and general relativity: a generalization of special relativity to include gravity (based on the principle of equivalence)

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

Einstein's general theory of relativity (noun)	general relativity (noun)
a generalization of special relativity to include gravity (based on the principle of equivalence)	a generalization of special relativity to include gravity (based on the principle of equivalence)