ráciovsratoTell them apart

Quick tell: rácio is a noun, rato is an adjective, so they fill different roles in a sentence.

Which to use

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

#39,370
“rácio” frequency rank
#5,246
“rato” frequency rank
44616
confusion score

Side-by-Side Comparison

Feature rácio rato
Definition relação ratificado; de verdade comprovada

Letter map: rácio vs rato

Shared letters muted; letters that set rácio and rato apart highlighted. Shared run: 2. rácio runs 5 letters (CVCVV) against rato's 4 (CVCV) - the length gap alone is often enough to separate them once you know to check it.

5 ch
rácio
4 ch
rato

Grammar separator: rácio vs rato

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: rácio is anoun and ratoanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 44616, derived from the frequency rank of both members and their visual similarity.

rácio is recorded at frequency rank #39,370, classified as anoun. rato is at rank #5,246, tagged as anadj, pronounced /ˈRa.tu/.

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 44616, this pair ranks #20,838 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of rácio vs rato

Shared letters: or. Private to "rácio": ciá. Private to "rato": at.

"rácio" · 5 letters · shape CVCVV  ·  "rato" · 4 letters · shape CVCV

Known mistypes of this pair

  • rato ← arto · raot · ratto · rrato · rtao

Frequently Asked Questions

Can "rácio" and "rato" be used interchangeably?
No - they are not even the same part of speech. "rácio" is a noun and "rato" an adjective, so a sentence built for one is usually ungrammatical with the other.
In ordinary Portuguese text, does "rácio" or "rato" show up more?
"rato" is the more common of the two: it sits at frequency rank #5,246 in our Portuguese list, against #39,370 for "rácio". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

You've compared "rácio" and "rato". Here's where to go from here.

  • Full dictionary entry for "rácio" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "rato" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #20,838 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "rácio" and "rato" also get mixed up with nearby pairs, the highest-scored neighbour is "rabi vs rácio". 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 #20,838 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