# xi vs XML

> 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.

### XML
*name · frequency rank #20,020*
Initialism of Extensible Markup Language, a flexible text format for creating structured computer documents in machine-readable form.

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