Here's how the root "pell" is used in these words:
* Pellet: This word comes from the Old French "pelote," which itself comes from the Latin "pila," meaning "ball" or "sphere."
* Pell-mell: This word signifies a state of confusion and disorder. It comes from the Old French phrase "à pell-mell," literally meaning "with the ball."
Therefore, "pell" doesn't have a distinct meaning on its own. It functions as part of a larger word, usually indicating some sort of round object or disorder.