# ASTM vs auth

> English confusable word pair

## The two words

### ASTM
*name · frequency rank #31,068*
Initialism of American Society for Testing and Materials; former name of ASTM International.

### auth
*noun · frequency rank #30,696*
Abbreviation of authentication.

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