Lu vs Lux, What's the Difference?

Which to use

“Lu” is an abbrev and “Lux” is a noun - they look or sound alike but fill different roles in a sentence.

#13,892
“Lu” frequency rank: #14,354
“Lux” frequency rank: 28246
confusion score

Side-by-Side Comparison

Feature	Lu	Lux
Definition	Lutetium	Einheit der Beleuchtungsstärke

Letter map: Lu vs Lux

Shared letters muted; letters that set Lu and Lux apart highlighted. Shared run: 2.

2 ch

3 ch

Lux

Grammar separator: Lu vs Lux

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Lu is anabbrev and Luxanoun. On the page they differ by 1 extra letter(s) - “Lu” sits inside “Lux”. Our composite confusion score for this pair is 28246, derived from the frequency rank of both members and their visual similarity.

Lu is recorded at frequency rank #13,892, classified as anabbrev. Lux is at rank #14,354, tagged as anoun, pronounced [lʊks].

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 28246, this pair ranks #1,788,107 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of Lu vs Lux

Shared letters: lu. Private to "Lu": -. Private to "Lux": x.

"Lu" · 2 letters · shape CV · "Lux" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "Lu" for "Lux" ever safe?

No - they are not even the same part of speech. "Lu" is an abbrev and "Lux" a noun, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "Lu" vs "Lux" - which ranks higher?

"Lu" is the more common of the two: it sits at frequency rank #13,892 in our German list, against #14,354 for "Lux". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

You've compared "Lu" and "Lux". Here's where to go from here.

Full dictionary entry for "Lu" 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 #1,788,107 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"Lu" and "Lux" also get mixed up with nearby pairs, the highest-scored neighbour is "Lai vs Lux". Nearby pair

Confusion rank #1,788,107 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.