Which to use
“LSD” and “lux” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #26,788
- “LSD” frequency rank
- #18,246
- “lux” frequency rank
- 45034
- confusion score
Side-by-Side Comparison
| Feature | LSD | lux |
|---|---|---|
| Definition | Composé organique de la famille des ergolines, le diéthylamide de l’acide lysergique, dérivé de l’acide lysergique présent dans l’ergot de seigle, connu comme un hallucinogène très puissant actif à de très faibles doses. | Unité de mesure d’éclairement lumineux du Système international, définie comme lumen par mètre carré, dont le symbole est lx. |
Where the eye mixes LSD and lux
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between LSD and lux
A purely visual mix-up. LSD (\ɛl.ɛs.de\) 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 share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 45034, derived from the frequency rank of both members and their visual similarity.
LSD is recorded at frequency rank #26,788, classified as anoun, pronounced \ɛl.ɛs.de\. 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 45034, this pair ranks #205,904 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of LSD vs lux
Shared letters: l. Private to "LSD": ds. Private to "lux": ux.
"LSD" · 3 letters · shape CCC · "lux" · 3 letters · shape CVC
Frequently Asked Questions
Is swapping "LSD" for "lux" ever safe?
Which is more common, "LSD" or "lux"?
After this comparison
Eye-level mix-up between "LSD" and "lux" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "LSD" 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 #205,904 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "LSD" and "lux" also get mixed up with nearby pairs, the highest-scored neighbour is "lep vs LSD". Nearby pair
Confusion rank #205,904 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.