# s vs SA

> English confusable word pair

## The two words

### s
*character · IPA /ɛs/ · frequency rank #142*
The nineteenth letter of the English alphabet, called ess and written in the Latin script.

### SA
*adjective · IPA /ˈɛs.eɪ/ · frequency rank #4,329*
Abbreviation of sinoatrial or sinoauricular.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/s-vs-sa