| Word root/ prefix | Root Meaning | Words based on the Root |
| Purg | clean | Purge - remove anything undesirable Purgatory - according to roman Catholics a place where souls must clean themselves of sin Expurgate - remove objectionable passages from a publication. |
| Pyr/o | fire/ high temperature | Pyrotechnics - a display of fireworks Pyrometer - a thermometer used for measuring high temperatures Pyretic - inducing fever. |
| Quad/r/ri | four/fourth | Quadrant - a circular sector equal to one-quarter of a circle/ open space with buildings on four sides Quadrennium - a time period of four years Quadruped - an animal with four feet. |
| Quart | fourth | Quarter - one-fourth of the total Quart - one-fourth of a gallon Quartet - a musical composition four voices or instruments. |
| Quin/t | five, fifth | Quintett - a composition for 5 voices or instruments Quintessence - pure essence, based on the ancient philosophy that there was a fifth element that was present in all things Quintuple - fivefold. |