acasovsacesoWhat's the difference?

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

Which to use

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

#2,759
“acaso” frequency rank
#23,544
“aceso” frequency rank
26303
confusion score

Side-by-Side Comparison

Feature acaso aceso
Definition casualmente que se acendeu

Letter map: acaso vs aceso

Shared letters muted; letters that set acaso and aceso apart highlighted. Shared run: 4. acaso and aceso follow the identical consonant-vowel pattern (VCVCV). Same shape at a glance is often the real trap, independent of shared letters.

5 ch
acaso
5 ch
aceso

Role in the sentence - acaso and aceso

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: acaso is anadverb and acesoanadjective. On the page they differ by a single letter - a in “acaso” becomes e in “aceso”. Our composite confusion score for this pair is 26303, derived from the frequency rank of both members and their visual similarity.

acaso is recorded at frequency rank #2,759, classified as anadv. aceso is at rank #23,544, tagged as anadj, pronounced /ɐ.ˈse.zu/.

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 26303, this pair ranks #42,880 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of acaso vs aceso

Shared letters: acos. Private to "acaso": -. Private to "aceso": e.

"acaso" · 5 letters · shape VCVCV  ·  "aceso" · 5 letters · shape VCVCV

Known mistypes of this pair

  • acaso ← aacso · acaos · acasso · accaso · acsao · caaso
  • aceso ← acceso · aceos · acseo · aecso · caeso

Frequently Asked Questions

Is swapping "acaso" for "aceso" ever safe?
No - they are not even the same part of speech. "acaso" is an adverb and "aceso" an adjective, so a sentence built for one is usually ungrammatical with the other.
In ordinary Portuguese text, does "acaso" or "aceso" show up more?
"acaso" is the more common of the two: it sits at frequency rank #2,759 in our Portuguese list, against #23,544 for "aceso". 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 "acaso" and "aceso".

  • Full dictionary entry for "acaso" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "aceso" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #42,880 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "acaso" and "aceso" also get mixed up with nearby pairs, the highest-scored neighbour is "aceso vs acs". 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 #42,880 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