# xi vs XP

> English confusable word pair

## The two words

### xi
*noun · IPA /zaɪ/ · frequency rank #5,928*
The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.

### XP
*noun · frequency rank #11,823*
Initialism of extreme programming.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/xi-vs-xp