# ACK vs ai

> English confusable word pair

## The two words

### ACK
*verb · frequency rank #33,924*
To acknowledge a packet or a message received from a network.

### ai
*noun · IPA /ˈɑ.i/ · frequency rank #4,818*
A type of three-toed sloth, Bradypus tridactylus, endemic to forests of southern Venezuela, the Guianas, and northern Brazil.

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