# OAS

> English word · Proper noun · frequency rank #44,377

## Definitions
1. Initialism of Organization of American States.
2. Initialism of Old Age Security.
3. Initialism of OpenAPI Specification, a specification for machine-readable interface files for describing, producing, consuming, and visualizing RESTful Web services.
4. Initialism of Organisation de l’Armée Secrète, a French organization.

## Easily confused with
- **of** (https://plainspell.com/en/vs/oas-vs-of)
- **on** (https://plainspell.com/en/vs/oas-vs-on)
- **or** (https://plainspell.com/en/vs/oas-vs-or)
- **OH** (https://plainspell.com/en/vs/oas-vs-oh)
- **OK** (https://plainspell.com/en/vs/oas-vs-ok)
- **op** (https://plainspell.com/en/vs/oas-vs-op)
- **OS** (https://plainspell.com/en/vs/oas-vs-os)
- **oz** (https://plainspell.com/en/vs/oas-vs-oz)
- **OT** (https://plainspell.com/en/vs/oas-vs-ot)
- **ou** (https://plainspell.com/en/vs/oas-vs-ou)
- **OG** (https://plainspell.com/en/vs/oas-vs-og)
- **oi** (https://plainspell.com/en/vs/oas-vs-oi)
- **ow** (https://plainspell.com/en/vs/oas-vs-ow)
- **OC** (https://plainspell.com/en/vs/oas-vs-oc)
- **oo** (https://plainspell.com/en/vs/oas-vs-oo)
- **om** (https://plainspell.com/en/vs/oas-vs-om)
- **ox** (https://plainspell.com/en/vs/oas-vs-ox)
- **ob** (https://plainspell.com/en/vs/oas-vs-ob)
- **od** (https://plainspell.com/en/vs/oas-vs-od)
- **OJ** (https://plainspell.com/en/vs/oas-vs-oj)

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