# A4 vs ah

> English confusable word pair

## The two words

### A4
*name · frequency rank #18,471*
A4 class, a class of steam locomotive used on the London and North Eastern Railway.

### ah
*intj · IPA /ɑː/ · frequency rank #2,325*
An expression of relief, relaxation, comfort, confusion, understanding, wonder, awe, etc. according to uttered inflection.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/a4-vs-ah