Common Words:
* Period: A punctuation mark, a recurring cycle, a span of time.
* Perimeter: The outer boundary of a two-dimensional shape.
* Periscope: A device for viewing objects that are out of sight.
* Peripheral: Relating to the outer edge or boundary.
* Periwinkle: A type of small, blue flower.
* Perish: To die or decay.
Less Common Words:
* Pericarp: The wall of a fruit that encloses the seed.
* Pericarditis: Inflammation of the membrane surrounding the heart.
* Peridot: A green gemstone.
* Perigee: The point in an orbit where the orbiting body is closest to the Earth.
* Perihelion: The point in an orbit where the orbiting body is closest to the Sun.
* Peril: Great danger.
* Perigee: The point in the orbit of an object (such as a satellite) orbiting Earth where it is closest to Earth.
* Perihelion: The point in the orbit of an object (such as a planet) orbiting the Sun where it is closest to the Sun.
* Peripatetic: Traveling from place to place, especially for work or study.
* Periptery: A building with a colonnade surrounding the central part.
* Periwinkle: A type of mollusk with a spiral shell.
Prefix "Peri-":
The prefix "peri-" often means "around" or "surrounding." So, many words beginning with "peri" refer to things that surround or are located on the edge of something.
Let me know if you'd like more words, or if you're looking for words with a specific meaning!