# don vs DOS

> English confusable word pair

## The two words

### don
*noun · IPA /dɒn/ · frequency rank #2,480*
A university professor, particularly one at Oxford or Cambridge.

### DOS
*noun · IPA /diː oː ˈɛs/ · frequency rank #11,370*
Initialism of date of service.

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