# NB vs NDC

> English confusable word pair

## The two words

### NB
*phrase · frequency rank #17,908*
Initialism of nota bene; used in written English to introduce something to be noted.

### NDC
*noun · frequency rank #46,084*
Initialism of negative differential conductance.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/nb-vs-ndc