# EP vs EPUB

> English confusable word pair

## The two words

### EP
*noun · frequency rank #5,033*
Initialism of extreme pressure, an indicator used in lubricant additives.

### EPUB
*name · frequency rank #49,318*
An e-book standard and file format based on HTML and designed to work across different devices and platforms, now governed by the W3C.

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