presovsprotoTell them apart

Quick tell: preso is a adjective, proto is an adverb, so they fill different roles in a sentence.

Which to use

“preso” is an adjective and “proto” is an adverb - they look or sound alike but fill different roles in a sentence.

#1,020
“preso” frequency rank
#35,741
“proto” frequency rank
36761
confusion score

Side-by-Side Comparison

Feature preso proto
Definition encarceirado, levado à prisão por isso

Letter map: preso vs proto

Shared letters muted; letters that set preso and proto apart highlighted. Shared run: 3. preso and proto follow the identical consonant-vowel pattern (CCVCV). Same shape at a glance is often the real trap, independent of shared letters.

5 ch
preso
5 ch
proto

Role in the sentence - preso and proto

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: preso is anadjective and protoanadverb. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 36761, derived from the frequency rank of both members and their visual similarity.

preso is recorded at frequency rank #1,020, classified as anadj. proto is at rank #35,741, tagged as anadv, pronounced /ˈproto/ ouvir^(fonte ?).

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 36761, this pair ranks #29,978 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of preso vs proto

Shared letters: opr. Private to "preso": es. Private to "proto": t.

"preso" · 5 letters · shape CCVCV  ·  "proto" · 5 letters · shape CCVCV

Known mistypes of this pair

  • preso ← perso · ppreso · preos · presso · prreso · prseo · rpeso
  • proto ← pproto · proot · protto · prroto · prtoo · rpoto

Frequently Asked Questions

Is swapping "preso" for "proto" ever safe?
No - they are not even the same part of speech. "preso" is an adjective and "proto" an adverb, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "preso" or "proto"?
"preso" is the more common of the two: it sits at frequency rank #1,020 in our Portuguese list, against #35,741 for "proto". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Done with this confusable. These links stay specific to "preso" and "proto".

  • Full dictionary entry for "preso" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "proto" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #29,978 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "preso" and "proto" also get mixed up with nearby pairs, the highest-scored neighbour is "Pluto vs proto". 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 #29,978 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list