| Radiate | Effuse, Emanate |
| Radical | Basic, Fundamental |
| Range | Anger, Furor |
| Rank | Arrange, Classify |
| Realize | Accomplish, Fulfill |
| Recalcitrant | Obstinate, Stubborn |
| Receptacle | Container, Repository |
| Reconcile | Atone, Conciliate |
| Regret | Deplore, Grieve |
| Reliable | Dependable, Trustworthy |
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