# USF vs USO

> English confusable word pair

## The two words

### USF
*name · frequency rank #38,224*
Initialism of Nintendo Ultra 64 Sound Format.

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

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