# sou vs STD

> English confusable word pair

## The two words

### sou
*noun · IPA /suː/ · frequency rank #35,525*
An old French copper coin equal to one twentieth of a livre or twelve deniers; one sou is to the livre as one shilling is to the pound.

### STD
*noun · frequency rank #16,797*
Initialism of sexually transmitted disease.

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