cair vs CEI, What's the Difference?

Which to use

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

#1,522
“cair” frequency rank: #29,625
“CEI” frequency rank: 31147
confusion score

Side-by-Side Comparison

Feature	cair	CEI
Definition	dar queda	Communauté des États Indépendants (português: Comunidade dos Estados Independentes, CEI)

Letter map: cair vs CEI

Shared letters muted; letters that set cair and CEI apart highlighted. Shared run: 2.

4 ch

cair

3 ch

CEI

Part-of-speech tell for cair / CEI

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: cair is averb and CEIanabbrev. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 31147, derived from the frequency rank of both members and their visual similarity.

cair is recorded at frequency rank #1,522, classified as averb. CEI is at rank #29,625, tagged as anabbrev, pronounced /se.ø.i/.

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 31147, this pair ranks #37,029 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of cair vs CEI

Shared letters: ci. Private to "cair": ar. Private to "CEI": e.

"cair" · 4 letters · shape CVVC · "CEI" · 3 letters · shape CVV

Known mistypes of this pair

cair ← acir · cairr · cari · ccair · ciar

Frequently Asked Questions

Can "cair" and "CEI" be used interchangeably?

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

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

"cair" is the more common of the two: it sits at frequency rank #1,522 in our Portuguese list, against #29,625 for "CEI". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

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

Full dictionary entry for "cair" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "CEI" - compare definitions side by side with the headword page. Word entry
This pair ranks #37,029 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"cair" and "CEI" also get mixed up with nearby pairs, the highest-scored neighbour is "CEI vs coin". 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 #37,029 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.