# STI vs still

> English confusable word pair

## The two words

### STI
*noun · frequency rank #26,266*
Initialism of sexually transmitted infection (also S.T.I.).

### still
*adjective · IPA /stɪl/ · frequency rank #127*
Not moving; calm.

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