| provide | provision |
| receive | reception |
| recognize | recognition |
| recover | recovery |
| reduce | reduction |
| refer | reference |
| refuse | refusal |
| remain | remant |
| remove | remoral |
| repeat | repetition |
| replace | replacement |
| require | requirement |
| resemble | resemblance |
| respond | responce |
| revise | revision |
| revolve | revolver |
| satisfy | satisfaction |
| sign | signature |
| signify | significantce |
| solve | solution |
| specify | specification |
| succeed | success |
| suggest | suggestion |
| transfer | transference |
| transmit | transmission |
| vary | variation |
| verify | verification |
| able | ability |
| accurate | accuraces |
| ambiguous | ambiguity |
| available | availability |
| aware | awreness |
| continuous | continuity |
| correct | correction |
| dense | density |
| distant | distance |
| efficient | efficienty |
| frequent | frequency |
| infinite | infinity |
| likely | likelihood |
| precise | precision |
| public | publication |
| pure | purity |
| ready | readiness |
| real | reality |
| regular | regularity |
| relevant | revance |
| responsible | responsibility |
| safe | safety |
| scarce | scaraty |
| secure | security |
| similar | similarity |
| stable | stability |
| valid | valiaity |
| weak | weakness |
