# SST vs sup

> English confusable word pair

## The two words

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

### sup
*verb · IPA /sʌp/ · frequency rank #13,818*
To sip; to take a small amount of food or drink into the mouth, especially with a spoon.

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