# N1 vs NN

> English confusable word pair

## The two words

### N1
*noun · frequency rank #30,893*
The rotational speed of the low-pressure spool of a multiple-spool gas turbine engine, expressed as a percentage of a certain reference rotational speed.

### NN
*noun · frequency rank #29,758*
net neutrality, network neutrality

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/n1-vs-nn