# ob vs OPI

> English confusable word pair

## The two words

### ob
*noun · IPA /ɒb/ · frequency rank #16,547*
a halfpenny

### OPI
*noun · frequency rank #45,558*
Initialism of office of primary interest.

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