# ISP vs ISR

> English confusable word pair

## The two words

### ISP
*noun · frequency rank #20,971*
Initialism of interstellar polarization.

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

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