# ACK vs arco

> English confusable word pair

## The two words

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

### arco
*adverb · frequency rank #49,190*
A note in string instrument musical notation indicating that the bow is to be used in the usual way, usually following a passage that is played pizzicato.

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