CairovscãoWhich spelling fits?

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

Which to use

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

#9,303
“Cairo” frequency rank
#3,065
“cão” frequency rank
12368
confusion score

Side-by-Side Comparison

Feature Cairo cão
Definition capital do Egito, país no qual é a maior cidade, posto que também ocupa no chamado mundo árabe cruel, brutal, dominador

Where the eye mixes Cairo and cão

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

5 ch
Cairo
3 ch
cão

Why the eye confuses Cairo with cão

These two trip readers on the page rather than in the ear: Cairo is /ˈkaj.ɾu/ while cão is /ˈkɐ̃ũ̯/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 12368, derived from the frequency rank of both members and their visual similarity.

Cairo is recorded at frequency rank #9,303, classified as anoun, pronounced /ˈkaj.ɾu/. cão is at rank #3,065, tagged as anadj, pronounced /ˈkɐ̃ũ̯/.

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 12368, this pair ranks #60,250 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of Cairo vs cão

Shared letters: co. Private to "Cairo": air. Private to "cão": ã.

"Cairo" · 5 letters · shape CVVCV  ·  "cão" · 3 letters · shape CVV

Known mistypes of this pair

  • Cairoaciro · caior · cairro · cario · ccairo · ciaro

Frequently Asked Questions

Can "Cairo" and "cão" be used interchangeably?
No - they are not even the same part of speech. "Cairo" is a noun and "cão" an adjective, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "Cairo" or "cão"?
"cão" is the more common of the two: it sits at frequency rank #3,065 in our Portuguese list, against #9,303 for "Cairo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "Cairo" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "cão" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #60,250 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "Cairo" and "cão" also get mixed up with nearby pairs, the highest-scored neighbour is "Cairo vs ciao". 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 #60,250 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