# ICAO vs ICS

> English confusable word pair

## The two words

### ICAO
*name · IPA /ˌaɪˈkeɪˌoʊ/ · frequency rank #41,186*
Acronym of International Civil Aviation Organization, a United Nations agency headquartered in Montreal, Canada.

### ICS
*name · frequency rank #28,246*
Initialism of Indy Car Series, the premier open-wheel racing series in the United States.

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