# L1 vs lum

> English confusable word pair

## The two words

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

### lum
*noun · IPA /lʌm/ · frequency rank #47,736*
A chimney; also, the top part of a chimney.

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