# b4 vs bo

> English confusable word pair

## The two words

### b4
*preposition · frequency rank #28,122*
Alternative letter-case form of B4 (“before”).

### bo
*intj · IPA /bəʊ/ · frequency rank #7,100*
An exclamation used to startle or frighten.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/b4-vs-bo