| Plektrum | plectrum |
| Plektron | plectrum |
| Spektrum | spectrum |
| Plenum | plenum |
| Plerem | morpheme |
| Elektro- | electro- |
| elektro- | electro- |
| Elektron | electron electrum |
| Rektum | rectum |
| Metrum | meter |
| Petrus | Peter |
| Lustrum | lustrum five-year period quinquennium |
| Neutrum | neuter |
| Philtrum | philtrum |
| Zentrum | center centre |
| Dekorum | decorum |
| Plenar- | plenary |
| Pleroma | pleroma |
| Pleskau | Pskov |
| Pleite | bankruptcy collapse bust failure fizzling flop washout |
| pleite | bankrupt broke skint |