Cain vs cair, What's the Difference?

Which to use

“Cain” is a noun and “cair” is a verb - they look or sound alike but fill different roles in a sentence.

#22,548
“Cain” frequency rank: #1,522
“cair” frequency rank: 24070
confusion score

Side-by-Side Comparison

Feature	Cain	cair
Definition	Caim	dar queda

Letter map: Cain vs cair

Shared letters muted; letters that set Cain and cair apart highlighted. Shared run: 3.

4 ch

Cain

4 ch

cair

Grammar separator: Cain vs cair

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Cain is anoun and cairaverb. On the page they differ by a single letter - n in “Cain” becomes r in “cair”. Our composite confusion score for this pair is 24070, derived from the frequency rank of both members and their visual similarity.

Cain is recorded at frequency rank #22,548, classified as anoun, pronounced /keɪn/.. cair is at rank #1,522, tagged as averb.

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 24070, this pair ranks #45,641 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Cain vs cair

Shared letters: aci. Private to "Cain": n. Private to "cair": r.

"Cain" · 4 letters · shape CVVC · "cair" · 4 letters · shape CVVC

Known mistypes of this pair

Cain ← acin · cainn · cani · ccain · cian
cair ← acir · cairr · cari · ccair · ciar

Frequently Asked Questions

Is swapping "Cain" for "cair" ever safe?

No - they are not even the same part of speech. "Cain" is a noun and "cair" a verb, so a sentence built for one is usually ungrammatical with the other.

In ordinary Portuguese text, does "Cain" or "cair" show up more?

"cair" is the more common of the two: it sits at frequency rank #1,522 in our Portuguese list, against #22,548 for "Cain". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Done with this confusable. These links stay specific to "Cain" and "cair".

Full dictionary entry for "Cain" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "cair" - compare definitions side by side with the headword page. Word entry
This pair ranks #45,641 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"Cain" and "cair" also get mixed up with nearby pairs, the highest-scored neighbour is "Cain vs cânon". 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 #45,641 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.