# ppm vs PTS

> English confusable word pair

## The two words

### ppm
*noun · frequency rank #23,949*
Initialism of parts per million (10000 ppm = 1%).

### PTS
*phrase · frequency rank #15,683*
Initialism of pay to surf: a business model where users are paid for viewing advertisements while browsing the World Wide Web.

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