ajustarvsassustarWhat's the difference?

Which to use

“ajustar” and “assustar” are a confusable Portuguese pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#12,602
“ajustar” frequency rank
#11,394
“assustar” frequency rank
23996
confusion score

Side-by-Side Comparison

Feature ajustar assustar
Definition fazer pequeno conserto ou ajuste numa peça de vestuário provocar susto ou receio; intimidar:

Where the eye mixes ajustar and assustar

Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. ajustar runs 7 letters (VCVCCVC) against assustar's 8 (VCCVCCVC) - the length gap alone is often enough to separate them once you know to check it.

7 ch
ajustar
8 ch
assustar

Why the eye confuses ajustar with assustar

A purely visual mix-up. ajustar (/ɐ.ʒuʃ.ˈtaɾ/) and assustar (/ɐ.suʃ.ˈtaɾ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 23996, derived from the frequency rank of both members and their visual similarity.

ajustar is recorded at frequency rank #12,602, classified as averb, pronounced /ɐ.ʒuʃ.ˈtaɾ/. assustar is at rank #11,394, tagged as averb, pronounced /ɐ.suʃ.ˈtaɾ/.

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 23996, this pair ranks #45,724 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ajustar vs assustar

Shared letters: arstu. Private to "ajustar": j. Private to "assustar": -.

"ajustar" · 7 letters · shape VCVCCVC  ·  "assustar" · 8 letters · shape VCCVCCVC

Known mistypes of this pair

  • ajustar ← ajjustar · ajsutar · ajusatr · ajusstar · ajustarr · ajustra · ajusttar · ajutsar
  • assustar ← asssutar · assusatr · assusstar · assustarr · assustra · assusttar · assutsar · asusstar

Frequently Asked Questions

Do "ajustar" and "assustar" mean the same thing in a sentence?
No. They are said differently (/ɐ.ʒuʃ.ˈtaɾ/ versus /ɐ.suʃ.ˈtaɾ/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Frequency check: "ajustar" vs "assustar" - which ranks higher?
"assustar" is the more common of the two: it sits at frequency rank #11,394 in our Portuguese list, against #12,602 for "ajustar". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "ajustar" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "assustar" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #45,724 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "ajustar" and "assustar" also get mixed up with nearby pairs, the highest-scored neighbour is "ajustar vs atestar". 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 #45,724 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