# L1 vs lu

> English confusable word pair

## The two words

### L1
*noun · frequency rank #24,220*
A mother tongue; someone's native language; own language.

### lu
*noun · IPA /luː/ · frequency rank #12,273*
Archaic form of loo (“card game”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/l1-vs-lu