# UFO vs USF

> English confusable word pair

## The two words

### UFO
*noun · IPA /ˌjuːɛfˈəʊ/ · frequency rank #15,539*
Initialism of unidentified flying object; (loosely) an alien spacecraft.

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

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