# sem vs SI

> English confusable word pair

## The two words

### sem
*noun · IPA /sɛm/ · frequency rank #21,060*
Clipping of seminary.

### 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/sem-vs-si