ui vs uña, What's the Difference?

Which to use

“ui” and “uña” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#23,979
“ui” frequency rank: #16,473
“uña” frequency rank: 40452
confusion score

Side-by-Side Comparison

Feature	ui	uña
Definition	Cebolla.	Capa queratinosa (córnea) que recubre el extremo de los dedos del hombre y de algunos animales. Algunos felinos, como los gatos, tienen uñas retráctiles.

Where the eye mixes ui and uña

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

3 ch

uña

Visual trap between ui and uña

A purely visual mix-up. ui ([œy]) and uña ([ˈuɲa]) 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 40452, derived from the frequency rank of both members and their visual similarity.

ui is recorded at frequency rank #23,979, classified as anoun, pronounced [œy]. uña is at rank #16,473, tagged as anoun, pronounced [ˈuɲa].

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 40452, this pair ranks #159,007 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ui vs uña

Shared letters: u. Private to "ui": i. Private to "uña": añ.

"ui" · 2 letters · shape VV · "uña" · 3 letters · shape VCV

Frequently Asked Questions

Can "ui" and "uña" be used interchangeably?

No. They are said differently ([œy] versus [ˈuɲa]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "ui" or "uña"?

"uña" is the more common of the two: it sits at frequency rank #16,473 in our Spanish list, against #23,979 for "ui". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Eye-level mix-up between "ui" and "uña" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "ui" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "uña" - compare definitions side by side with the headword page. Word entry
This pair ranks #159,007 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"ui" and "uña" also get mixed up with nearby pairs, the highest-scored neighbour is "ui vs UPN". Nearby pair

Confusion rank #159,007 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.