# SST vs STD

> English confusable word pair

## The two words

### SST
*noun · frequency rank #43,385*
Initialism of supersonic transport.

### 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/sst-vs-std