ses vs su, What's the Difference?

Which to use

“ses” is an article and “su” is an adjective - they look or sound alike but fill different roles in a sentence.

#27,012
“ses” frequency rank: #20
“su” frequency rank: 27032
confusion score

Side-by-Side Comparison

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

Where the eye mixes ses and su

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

3 ch

ses

2 ch

Look-alike desk: ses vs su

These two trip readers on the page rather than in the ear: ses is [ˈses] while su is [su]. 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 (article vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 27032, derived from the frequency rank of both members and their visual similarity.

ses is recorded at frequency rank #27,012, classified as anarticle, pronounced [ˈses]. 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 27032, this pair ranks #228,781 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ses vs su

Shared letters: s. Private to "ses": e. Private to "su": u.

"ses" · 3 letters · shape CVC · "su" · 2 letters · shape CV

Frequently Asked Questions

Do "ses" and "su" mean the same thing in a sentence?

No - they are not even the same part of speech. "ses" is an article and "su" an adjective, so a sentence built for one is usually ungrammatical with the other.

In ordinary Spanish text, does "ses" or "su" show up more?

"su" is the more common of the two: it sits at frequency rank #20 in our Spanish list, against #27,012 for "ses". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "ses" 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 #228,781 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"ses" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "ses vs stem". Nearby pair

Confusion rank #228,781 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.