# STM vs su

> French confusable word pair

## The two words

### STM
*noun · frequency rank #23,698*
Microscopie à effet tunnel.

### su
*verb · IPA \sy\ · frequency rank #1,609*
Participe passé masculin singulier du verbe savoir.

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