seu vs su, What's the Difference?

Which to use

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

#35,751
“seu” frequency rank: #20
“su” frequency rank: 35771
confusion score

Side-by-Side Comparison

Feature	seu	su
Definition	Su.	Adjetivo posesivo de la tercera persona; de él, de ella, de ellos, de ellas.

Where the eye mixes seu and su

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

3 ch

seu

2 ch

Visual trap between seu and su

A purely visual mix-up. seu ([ˈsew]) and su ([su]) 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 35771, derived from the frequency rank of both members and their visual similarity.

seu is recorded at frequency rank #35,751, classified as anadj, pronounced [ˈsew]. su is at rank #20, tagged as anadj, pronounced [su].

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 35771, this pair ranks #184,247 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of seu vs su

Shared letters: su. Private to "seu": e. Private to "su": -.

"seu" · 3 letters · shape CVV · "su" · 2 letters · shape CV

Frequently Asked Questions

Can "seu" and "su" be used interchangeably?

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

Which is more common, "seu" or "su"?

"su" is the more common of the two: it sits at frequency rank #20 in our Spanish list, against #35,751 for "seu". 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 "seu" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "su" - compare definitions side by side with the headword page. Word entry
This pair ranks #184,247 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"seu" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "seu vs stem". Nearby pair

Confusion rank #184,247 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.