# reflex vs reflux

> English confusable word pair

## The two words

### reflex
*noun · IPA /ˈɹiːflɛks/ · frequency rank #16,321*
An automatic response to a simple stimulus which does not require mental processing.

### reflux
*noun · IPA /ˈɹiː.flʌks/ · frequency rank #29,435*
The backwards flow of any fluid.

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