- Difference between republic and monarchy
- Difference between rule and norm
- Difference between RAM and ROM
- Difference between realism and naturalism
- Difference between river and stream
- Difference between radiation and radioactivity
- Difference between realism and nominalism
- Difference between rhyme and rhythm
- Difference between royalty and nobility
- Difference between race and species
- Difference between rationalism and empiricism
- Difference between relativism and subjectivism
- Difference between River and Lake
- Difference between russia and soviet union
- Difference between Rich and Wealthy