# ARP vs atop

> English confusable word pair

## The two words

### ARP
*noun · frequency rank #41,514*
Initialism of absolute refractory period.

### atop
*preposition · IPA /əˈtɒp/ · frequency rank #12,368*
On the top of.

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