| rational | rational |
| Rationale | rationale |
| arational | arational |
| national | national |
| Ration | ration |
| Rationalismus | rationalism |
| irrational | irrational |
| rationell | economic |
| relational | relational |
| optional | optional |
| regional | regional |
| atonal | atonal |
| Oration | collect |
| rate mal | guess what |
| Rating | rating |
| Ratio | reason ratio |
| Rätien | Raetia |
| Rätin | councillor councillour councilor councilour |
| rationale Zahl | rational number rational numbers |
| -ation | -ation |