su vs suu, What's the Difference?

Which to use

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

#6,713
“su” frequency rank: #47,111
“suu” frequency rank: 53824
confusion score

Side-by-Side Comparison

Feature	su	suu
Definition	dele	boca, cavidade oral

Letter map: su vs suu

Shared letters muted; letters that set su and suu apart highlighted. Shared run: 2. su runs 2 letters (CV) against suu's 3 (CVV) - the length gap alone is often enough to separate them once you know to check it.

2 ch

3 ch

suu

Grammar separator: su vs suu

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: su is anadjective and suuanoun. On the page they differ by 1 extra letter(s) - “su” sits inside “suu”. Our composite confusion score for this pair is 53824, derived from the frequency rank of both members and their visual similarity.

su is recorded at frequency rank #6,713, classified as anadj. suu is at rank #47,111, tagged as anoun, pronounced /ˈsuː/.

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 53824, this pair ranks #11,748 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of su vs suu

Shared letters: su. Private to "su": -. Private to "suu": -.

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

Frequently Asked Questions

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

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

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

"su" is the more common of the two: it sits at frequency rank #6,713 in our Portuguese list, against #47,111 for "suu". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "su" and "suu".

Full dictionary entry for "su" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "suu" - compare definitions side by side with the headword page. Word entry
This pair ranks #11,748 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"su" and "suu" also get mixed up with nearby pairs, the highest-scored neighbour is "Sau vs suu". Nearby pair

Confusion rank #11,748 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.