si vs sus, What's the Difference?

Which to use

“si” is a pronoun and “sus” is an intj - they look or sound alike but fill different roles in a sentence.

#482
“si” frequency rank: #7,578
“sus” frequency rank: 8060
confusion score

Side-by-Side Comparison

Feature	si	sus
Definition	refere-se à terceira pessoa, indica reflexividade e é usado após preposição (a, de, em, contra, sobre, por, etc., exceto com)	interjeição que demonstra impaciência (século XVI)

Letter map: si vs sus

Shared letters muted; letters that set si and sus apart highlighted. Shared run: 1.

2 ch

3 ch

sus

Grammar separator: si vs sus

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: si is apronoun and susanintj. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 8060, derived from the frequency rank of both members and their visual similarity.

si is recorded at frequency rank #482, classified as apron, pronounced /ˈsi/. sus is at rank #7,578, tagged as anintj.

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 8060, this pair ranks #65,857 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of si vs sus

Shared letters: s. Private to "si": i. Private to "sus": u.

"si" · 2 letters · shape CV · "sus" · 3 letters · shape CVC

Frequently Asked Questions

Can "si" and "sus" be used interchangeably?

No - they are not even the same part of speech. "si" is a pronoun and "sus" an intj, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "si" or "sus"?

"si" is the more common of the two: it sits at frequency rank #482 in our Portuguese list, against #7,578 for "sus". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "si" vs "sus" is on the table, pick a follow-up below.

Full dictionary entry for "si" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sus" - compare definitions side by side with the headword page. Word entry
This pair ranks #65,857 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"si" and "sus" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs sus". Nearby pair

Confusion rank #65,857 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.