# UD vs um

> English confusable word pair

## The two words

### UD
*adjective · frequency rank #23,139*
Abbreviation of undead.

### um
*intj · IPA /ʌm/ · frequency rank #5,846*
Expression of hesitation, uncertainty or space filler in conversation.

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