# UAS vs UFO

> English confusable word pair

## The two words

### UAS
*noun · frequency rank #49,687*
Initialism of uncrewed aerial system, unmanned aerial system, uncrewed aircraft system, or unmanned aircraft system: an aircraft with no onboard pilot, and sometimes completely unpiloted, as well as the other components of the system, including automated guidance and telemetry, a remote operator if any, etc.

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

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