le vs lux, What's the Difference?

Which to use

“le” is an article and “lux” is a noun - they look or sound alike but fill different roles in a sentence.

#3,005
“le” frequency rank: #18,878
“lux” frequency rank: 21883
confusion score

Side-by-Side Comparison

Feature	le	lux
Definition	the	In the International System of Units, the derived unit of illuminance or illumination; one lumen per square metre. Symbol: lx

Where the eye mixes le and lux

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

3 ch

lux

Look-alike desk: le vs lux

These two trip readers on the page rather than in the ear: le is /lə/ while lux is /lʌks/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (article vs noun), which is usually the fastest check. Our composite confusion score for this pair is 21883, derived from the frequency rank of both members and their visual similarity.

le is recorded at frequency rank #3,005, classified as anarticle, pronounced /lə/. lux is at rank #18,878, tagged as anoun, pronounced /lʌks/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 21883, this pair ranks #420,665 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of le vs lux

Shared letters: l. Private to "le": e. Private to "lux": ux.

"le" · 2 letters · shape CV · "lux" · 3 letters · shape CVC

Frequently Asked Questions

Can "le" and "lux" be used interchangeably?

No - they are not even the same part of speech. "le" is an article and "lux" a noun, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "le" vs "lux" - which ranks higher?

"le" is the more common of the two: it sits at frequency rank #3,005 in our English list, against #18,878 for "lux". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "le" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "lux" - compare definitions side by side with the headword page. Word entry
This pair ranks #420,665 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"le" and "lux" also get mixed up with nearby pairs, the highest-scored neighbour is "LSC vs lux". Nearby pair

Confusion rank #420,665 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.