# NAS vs NB

> English confusable word pair

## The two words

### NAS
*name · frequency rank #14,372*
Initialism of National Academy of Sciences (US).

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

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