# opal vs opus

> English confusable word pair

## The two words

### opal
*noun · IPA /ˈəʊpəl/ · frequency rank #22,458*
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.

### opus
*noun · IPA /ˈəʊpəs/ · frequency rank #23,619*
A work of music or set of works with a specified rank in an ordering of a composer's complete published works.

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