| Pentalogie | pentalogy |
| Genealogie | genealogy |
| Pentarchie | Pentarchy |
| Aretalogie | aretalogy |
| Genealoge | genealogist |
| Genealogin | genealogist |
| Tetralogie | tetralogy |
| Analogie | analogy |
| Petrologie | petrology |
| Pönologie | penology |
| Deontologie | deontology |
| Keltologie | Celtic studies |
| Ontologie | ontology |
| Pedologie | pedology |
| Phytologie | phytology |
| Protologie | protology |
| Senologie | senology |
| Peniaphobie | peniaphobia |
| Pentachlorid | pentachloride |
| Pentade | pentade |