# piston vs poison

> English confusable word pair

## The two words

### piston
*noun · IPA /ˈpɪstən/ · frequency rank #15,677*
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)

### poison
*noun · IPA /ˈpɔɪ.zən/ · frequency rank #6,282*
A substance that is harmful or lethal to a living organism when ingested.

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