| 1 | Middle English | rancour | Jealousy, ire, towards someone; rancour;... |
| 2 | Old French | rancor | ill-will; negative opinion or intention |
| 3 | Latin | rancor | rancidity, stench, rankness; grudge, rancor |
| 4 | Latin | -or | used to form a third-declension masculine... |
| 5 | Proto-Italic | -ōs | Creates masculine action nouns or result nouns... |
| 6 | Proto-Indo-European | -ōs | Creates masculine and feminine action nouns or... |
| 7 | Proto-Indo-European | -oss | — |
| 8 | Proto-Indo-European | -os | Creates action nouns or result nouns from verbs;... |