# ISR vs isu

> English confusable word pair

## The two words

### ISR
*noun · frequency rank #49,434*
Initialism of interrupt service routine.

### isu
*noun · frequency rank #37,989*
An individual seat in the loft-like balcony of a sumo arena.

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