# SCI vs SI

> English confusable word pair

## The two words

### SCI
*noun · frequency rank #7,845*
Initialism of secured compartmentalized information/secured compartmented information.

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

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