As nouns,
Einstein's special theory of relativity is a hyponym of
relativity; that is,
Einstein's special theory of relativity is a
word with a more specific, narrower meaning than
relativity:
- relativity: (physics) the theory that space and time are relative concepts rather than absolute concepts
- Einstein's special theory of relativity: a physical theory of relativity based on the assumption that the speed of light in a vacuum is a constant and the assumption that the laws of physics are invariant in all inertial systems