# SI vs sky

> English confusable word pair

## The two words

### SI
*name · frequency rank #5,453*
International System of Units

### sky
*noun · IPA /skaɪ/ · frequency rank #1,968*
The atmosphere above a given point, especially as visible from the surface of the Earth as the place where the sun, moon, stars, and clouds are seen.

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