| Uperisation | uperisation |
| Operation | surgery operation |
| Derivation | derivation |
| Maderisation | maderisation |
| Autorisation | authorisation authorization |
| Perkolation | percolation |
| Perfektion | perfection |
| Periastron | periastron |
| Permutation | permutation |
| Perspiration | perspiration |
| Persuasion | persuasion |
| Perzeption | perception |
| Sterilisation | sterilization |
| Puristin | purist |
| -isation | -ization |
| Memoisation | memoization |
| Realisation | realization |
| Ionisation | ionization ionisation |
| Ipsation | masturbation |
| Sensation | sensation |