| 165 | reduce |
| 1093 | reduction |
| 2518 | redundant |
| 1386 | reef |
| 551 | reflect |
| 902 | reference |
| 941 | refuse |
| 1055 | refer |
| 2016 | reform |
| 2273 | refine |
| 2559 | refrigerator |
| 2879 | refuge |
| 3299 | reflex |
| 256 | region |
| 808 | regulation |
| 821 | regard |
| 1186 | register |
| 1223 | regular |
| 2187 | regardless |
| 3128 | regret |
| 2979 | reinforcement |
| 1094 | reject |
