# SDP vs SST

> English confusable word pair

## The two words

### SDP
*name · frequency rank #49,622*
Initialism of Social Democratic Party, a centre-left political party in the United Kingdom.

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

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