lumenvsluneWhich spelling fits?

Which to use

“lumen” and “lune” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#43,534
“lumen” frequency rank
#2,045
“lune” frequency rank
45579
confusion score

Side-by-Side Comparison

Feature lumen lune
Definition Unité de mesure de flux lumineux du Système international, équivalant à une candela-stéradian, définie comme le flux lumineux de la lumière monochromatique de fréquence de 540 térahertz et de puissance de 1/683 de watt. Le symbole en est lm. Satellite naturel de la Terre, qui tourne autour de celle-ci en un cycle de vingt-sept jours sept heures quarante-trois minutes. Le satellite réfléchit sur la Terre la lumière qu’il reçoit du Soleil. Lune s’écrit avec une majuscule en astronomie lorsqu'on s'en sert comme nom propre de cet astre, pour le distinguer des autres satellites naturels.

Where the eye mixes lumen and lune

Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.

5 ch
lumen
4 ch
lune

Look-alike desk: lumen vs lune

A purely visual mix-up. lumen (\ly.mɛn\) and lune (\lyn\) 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 1 letter(s) in length. Our composite confusion score for this pair is 45579, derived from the frequency rank of both members and their visual similarity.

lumen is recorded at frequency rank #43,534, classified as anoun, pronounced \ly.mɛn\. lune is at rank #2,045, tagged as anoun, pronounced \lyn\.

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 45579, this pair ranks #201,645 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of lumen vs lune

Shared letters: elnu. Private to "lumen": m. Private to "lune": -.

"lumen" · 5 letters · shape CVCVC  ·  "lune" · 4 letters · shape CVCV

Known mistypes of this pair

  • lumenllumen · lmuen · luemn · lumenn · lummen · lumne · ulmen
  • lunellune · lnue · luen · lunne · ulne

Frequently Asked Questions

Is swapping "lumen" for "lune" ever safe?
No. They are said differently (\ly.mɛn\ versus \lyn\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Frequency check: "lumen" vs "lune" - which ranks higher?
"lune" is the more common of the two: it sits at frequency rank #2,045 in our French list, against #43,534 for "lumen". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "lumen" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "lune" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #201,645 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "lumen" and "lune" also get mixed up with nearby pairs, the highest-scored neighbour is "lumen vs lure". Nearby pair
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #201,645 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list