su vs Sure, What's the Difference?

Which to use

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

#6,713
“su” frequency rank: #33,629
“Sure” frequency rank: 40342
confusion score

Side-by-Side Comparison

Feature	su	Sure
Definition	dele	surata

Letter map: su vs Sure

Shared letters muted; letters that set su and Sure apart highlighted. Shared run: 2.

2 ch

4 ch

Sure

Part-of-speech tell for su / Sure

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: su is anadjective and Sureanoun. On the page they differ by 2 extra letter(s) - “su” sits inside “Sure”. Our composite confusion score for this pair is 40342, derived from the frequency rank of both members and their visual similarity.

su is recorded at frequency rank #6,713, classified as anadj. Sure is at rank #33,629, tagged as anoun, pronounced /ˈzuːrə/.

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 40342, this pair ranks #25,783 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of su vs Sure

Shared letters: su. Private to "su": -. Private to "Sure": er.

"su" · 2 letters · shape CV · "Sure" · 4 letters · shape CVCV

Known mistypes of this pair

Sure ← srue · ssure · suer · surre · usre

Frequently Asked Questions

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

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

In ordinary Portuguese text, does "su" or "Sure" show up more?

"su" is the more common of the two: it sits at frequency rank #6,713 in our Portuguese list, against #33,629 for "Sure". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

You've compared "su" and "Sure". Here's where to go from here.

Full dictionary entry for "su" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Sure" - compare definitions side by side with the headword page. Word entry
This pair ranks #25,783 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"su" and "Sure" also get mixed up with nearby pairs, the highest-scored neighbour is "sire vs Sure". 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 #25,783 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.