Which to use
“lut” and “lux” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #40,358
- “lut” frequency rank
- #18,246
- “lux” frequency rank
- 58604
- confusion score
Side-by-Side Comparison
| Feature | lut | lux |
|---|---|---|
| Definition | Se dit de pâtes ou d'enduits qu'on applique sur les bouchons des vases pour en assurer la fermeture hermétique, autour des cornues, des tubes de verre pour les soustraire à l'action directe du feu, ou qu'on utilise pour obturer des trous, pour faire des joints etc. | Unité de mesure d’éclairement lumineux du Système international, définie comme lumen par mètre carré, dont le symbole est lx. |
Where the eye mixes lut and lux
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: lut vs lux
A purely visual mix-up. lut (\lyt\) and lux (\lyks\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - t in “lut” becomes x in “lux”. Our composite confusion score for this pair is 58604, derived from the frequency rank of both members and their visual similarity.
lut is recorded at frequency rank #40,358, classified as anoun, pronounced \lyt\. lux is at rank #18,246, tagged as anoun, pronounced \lyks\.
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 58604, this pair ranks #108,087 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of lut vs lux
Shared letters: lu. Private to "lut": t. Private to "lux": x.
"lut" · 3 letters · shape CVC · "lux" · 3 letters · shape CVC
Frequently Asked Questions
Do "lut" and "lux" mean the same thing in a sentence?
Which is more common, "lut" or "lux"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "lut" 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 #108,087 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "lut" and "lux" also get mixed up with nearby pairs, the highest-scored neighbour is "lep vs lut". Nearby pair
Confusion rank #108,087 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.