# piston vs prison

> 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)

### prison
*noun · IPA /ˈpɹɪzn̩/ · frequency rank #1,670*
A place or institution where people are held against their will, in the US especially for long-term confinement, as of those convicted of serious crimes or otherwise considered undesirable by the government.

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