# CD4 vs CU

> English confusable word pair

## The two words

### CD4
*noun · frequency rank #39,729*
A glycoprotein found on the surface of helper T cells and several other types of immune cells.

### CU
*noun · frequency rank #13,895*
Initialism of control unit.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/cd4-vs-cu