s vs sob, What's the Difference?

Which to use

“s” is a symbol and “sob” is a preposition - they look or sound alike but fill different roles in a sentence.

#511
“s” frequency rank: #320
“sob” frequency rank: 831
confusion score

Side-by-Side Comparison

Feature	s	sob
Definition	símbolo de segundo	abaixo, em baixo

Letter map: s vs sob

Shared letters muted; letters that set s and sob apart highlighted. Shared run: 1.

1 ch

3 ch

sob

Grammar separator: s vs sob

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: s is asymbol and sobapreposition. On the page they differ by 2 extra letter(s) - “s” sits inside “sob”. Our composite confusion score for this pair is 831, derived from the frequency rank of both members and their visual similarity.

s is recorded at frequency rank #511, classified as asymbol. sob is at rank #320, tagged as aprep, pronounced /ˈsob/.

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 831, this pair ranks #74,804 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of s vs sob

Shared letters: s. Private to "s": -. Private to "sob": bo.

"s" · 1 letters · shape C · "sob" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "s" for "sob" ever safe?

No - they are not even the same part of speech. "s" is a symbol and "sob" a preposition, so a sentence built for one is usually ungrammatical with the other.

In ordinary Portuguese text, does "s" or "sob" show up more?

"sob" is the more common of the two: it sits at frequency rank #320 in our Portuguese list, against #511 for "s". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Done with this confusable. These links stay specific to "s" and "sob".

Full dictionary entry for "s" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sob" - compare definitions side by side with the headword page. Word entry
This pair ranks #74,804 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"s" and "sob" also get mixed up with nearby pairs, the highest-scored neighbour is "soap vs sob". Nearby pair

Confusion rank #74,804 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.