# USO vs UST

> English confusable word pair

## The two words

### USO
*noun · frequency rank #35,573*
Unidentified submerged object or unidentified submarine object.

### UST
*noun · frequency rank #24,946*
Initialism of unresolved sexual tension.

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