CEI vs cem, What's the Difference?

Which to use

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

#29,625
“CEI” frequency rank: #3,188
“cem” frequency rank: 32813
confusion score

Side-by-Side Comparison

Feature	CEI	cem
Definition	Communauté des États Indépendants (português: Comunidade dos Estados Independentes, CEI)	número equivalente a dez dezenas; cardinalidade de um conjunto que contenha uma centena de elementos distintos; representado pelo símbolo 100 (algarismos arábicos) ou C (algarismos romanos)

Where the spellings diverge

Shared letters are muted; the letters that actually set CEI and cem apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

CEI

3 ch

cem

Spelling & Dictionary Insight

CEI and cem form a confusable pair in the Portuguese index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - i in “CEI” becomes m in “cem” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 32813, derived from the frequency rank of both members and their visual similarity.

CEI is recorded at frequency rank #29,625, classified as anabbrev, pronounced /se.ø.i/. cem is at rank #3,188, tagged as anum, pronounced /ˈsɐ̃j̃/.

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 32813, this pair ranks #34,879 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Frequency comparison

CEI#29,625

cem#3,188

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

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

No, "CEI" and "cem" have distinct meanings and cannot be swapped without changing the meaning of a sentence. Understanding the specific definition and context for each word is essential for correct usage.

Remembering CEI vs cem

The fastest way to pick the right one every time.

Check the role first: if you need an abbrev, it's “CEI”; for a num, it's “cem”.
See each word in full, definition, IPA, etymology and its other confusables. Full “CEI” entry
Browse more pairs most likely to be confused. Most confusable