# USO vs USP

> English confusable word pair

## The two words

### USO
*noun · frequency rank #35,573*
Unidentified submerged object or unidentified submarine object.

### USP
*name · frequency rank #33,071*
The United States Pharmacopeial Convention, Inc., a standard-setting authority that publishes USP-NF standards about pharmaceuticals and dietary supplements.

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