Which to use
“lb” is a symbol and “lux” is a noun - they look or sound alike but fill different roles in a sentence.
- #22,921
- “lb” frequency rank
- #18,246
- “lux” frequency rank
- 41167
- confusion score
Side-by-Side Comparison
| Feature | lb | lux |
|---|---|---|
| Definition | Symbole de la livre (pound), unité de mesure de masse anglo-saxonne. Cette livre est ordinairement dans le système avoir-du-poids ; il y a aussi une livre apothicaire (apothecary pound ou troy pound) — les symboles respectifs sont lb av et lb t ou lb Tr. La livre française, elle, avait pour symbole lp. | Unité de mesure d’éclairement lumineux du Système international, définie comme lumen par mètre carré, dont le symbole est lx. |
Letter map: lb vs lux
Shared letters muted; letters that set lb and lux apart highlighted. Shared run: 1.
Role in the sentence - lb and lux
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: lb is asymbol and luxanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 41167, derived from the frequency rank of both members and their visual similarity.
lb is recorded at frequency rank #22,921, classified as asymbol. 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 41167, this pair ranks #235,120 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of lb vs lux
Shared letters: l. Private to "lb": b. Private to "lux": ux.
"lb" · 2 letters · shape CC · "lux" · 3 letters · shape CVC
Frequently Asked Questions
Do "lb" and "lux" mean the same thing in a sentence?
In ordinary French text, does "lb" or "lux" show up more?
Useful next steps
Done with this confusable. These links stay specific to "lb" and "lux".
- Full dictionary entry for "lb" 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 #235,120 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "lb" and "lux" also get mixed up with nearby pairs, the highest-scored neighbour is "lb vs lobo". Nearby pair
Confusion rank #235,120 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.