Which to use
“lux” and “luz” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #23,482
- “lux” frequency rank
- #469
- “luz” frequency rank
- 23951
- confusion score
Side-by-Side Comparison
| Feature | lux | luz |
|---|---|---|
| Definition | Unidad derivada del Sistema Internacional de Unidades para la iluminancia o nivel de iluminación, equivalente a un lumen por metro cuadrado. | Radiación electromagnética visible al ojo humano. |
Where the eye mixes lux and luz
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between lux and luz
A purely visual mix-up. lux ([ˈluks]) and luz ([ˈlus]) 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 - x in “lux” becomes z in “luz”. Our composite confusion score for this pair is 23951, derived from the frequency rank of both members and their visual similarity.
lux is recorded at frequency rank #23,482, classified as anoun, pronounced [ˈluks]. luz is at rank #469, tagged as anoun, pronounced [ˈlus].
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 23951, this pair ranks #243,409 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of lux vs luz
Shared letters: lu. Private to "lux": x. Private to "luz": z.
"lux" · 3 letters · shape CVC · "luz" · 3 letters · shape CVC
Frequently Asked Questions
Do "lux" and "luz" mean the same thing in a sentence?
Frequency check: "lux" vs "luz" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "lux" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "luz" - compare definitions side by side with the headword page. Word entry
- This pair ranks #243,409 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "lux" and "luz" also get mixed up with nearby pairs, the highest-scored neighbour is "lac vs lux". Nearby pair
Confusion rank #243,409 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.