Which to use
“cos” is a pronoun and “cum” is a preposition - they look or sound alike but fill different roles in a sentence.
- #27,810
- “cos” frequency rank
- #29,299
- “cum” frequency rank
- 57109
- confusion score
Side-by-Side Comparison
| Feature | cos | cum |
|---|---|---|
| Definition | qualquer coisa | usado para indicar algo com duas funções, ou então que tenha se modificado de uma coisa para outra: |
Letter map: cos vs cum
Shared letters muted; letters that set cos and cum apart highlighted. Shared run: 1. cos and cum follow the identical consonant-vowel pattern (CVC). Same shape at a glance is often the real trap, independent of shared letters.
Role in the sentence - cos and cum
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: cos is apronoun and cumapreposition. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 57109, derived from the frequency rank of both members and their visual similarity.
cos is recorded at frequency rank #27,810, classified as apron. cum is at rank #29,299, tagged as aprep, pronounced /kʌm/.
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 57109, this pair ranks #9,535 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of cos vs cum
Shared letters: c. Private to "cos": os. Private to "cum": mu.
"cos" · 3 letters · shape CVC · "cum" · 3 letters · shape CVC
Frequently Asked Questions
Can "cos" and "cum" be used interchangeably?
Frequency check: "cos" vs "cum" - which ranks higher?
After this comparison
Pair "cos" vs "cum" is on the table, pick a follow-up below.
- Full dictionary entry for "cos" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "cum" - compare definitions side by side with the headword page. Word entry
- This pair ranks #9,535 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "cos" and "cum" also get mixed up with nearby pairs, the highest-scored neighbour is "cham vs cum". Nearby pair
Confusion rank #9,535 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.