# RR vs RSS

> English confusable word pair

## The two words

### RR
*noun · frequency rank #17,232*
Initialism of railroad.

### RSS
*name · frequency rank #15,496*
Initialism of Rich Site Summary / Really Simple Syndication (“mechanism to follow updates on other websites such as news, music, blogs, etc.”).

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