lui vs lung, What's the Difference?

Which to use

“lui” is a verb and “lung” is a noun - they look or sound alike but fill different roles in a sentence.

#36,659
“lui” frequency rank: #45,426
“lung” frequency rank: 82085
confusion score

Side-by-Side Comparison

Feature	lui	lung
Definition	Primera persona del singular (yo) del pretérito perfecto simple de indicativo de luir.	Pulmón.

Where the eye mixes lui and lung

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

3 ch

lui

4 ch

lung

Why the eye confuses lui with lung

These two trip readers on the page rather than in the ear: lui is [ˈlwi] while lung is /lʌŋ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 82085, derived from the frequency rank of both members and their visual similarity.

lui is recorded at frequency rank #36,659, classified as averb, pronounced [ˈlwi]. lung is at rank #45,426, tagged as anoun, pronounced /lʌŋ/.

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 82085, this pair ranks #9,619 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of lui vs lung

Shared letters: lu. Private to "lui": i. Private to "lung": gn.

"lui" · 3 letters · shape CVV · "lung" · 4 letters · shape CVCC

Known mistypes of this pair

lung ← llung · lnug · lugn · lungg · lunng · ulng

Frequently Asked Questions

Is swapping "lui" for "lung" ever safe?

No - they are not even the same part of speech. "lui" is a verb and "lung" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "lui" or "lung"?

"lui" is the more common of the two: it sits at frequency rank #36,659 in our Spanish list, against #45,426 for "lung". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "lui" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "lung" - compare definitions side by side with the headword page. Word entry
This pair ranks #9,619 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"lui" and "lung" also get mixed up with nearby pairs, the highest-scored neighbour is "longo vs lung". 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 #9,619 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.