# fi vs FSB

> English confusable word pair

## The two words

### fi
*noun · IPA /fiː/ · frequency rank #4,603*
The solfeggio syllable used to indicate the sharp of the fourth note of a major scale.

### FSB
*name · frequency rank #32,815*
The Federal Security Service of the Russian Federation.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/fi-vs-fsb