Which to use
“cassar” is a verb and “castor” is a noun - they look or sound alike but fill different roles in a sentence.
- #34,183
- “cassar” frequency rank
- #16,007
- “castor” frequency rank
- 50190
- confusion score
Side-by-Side Comparison
| Feature | cassar | castor |
|---|---|---|
| Definition | impedir que produza efeitos, anular, revogar (direitos políticos, mandatos, licenças, etc.): | roedor semi-aquáticos da família Castoridae, nativo da América do Norte e da Europa |
Where the eye mixes cassar and castor
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. cassar and castor follow the identical consonant-vowel pattern (CVCCVC). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses cassar with castor
These two trip readers on the page rather than in the ear: cassar is /ka.ˈsaɾ/ while castor is /kɐsˈtoɾ/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 50190, derived from the frequency rank of both members and their visual similarity.
cassar is recorded at frequency rank #34,183, classified as averb, pronounced /ka.ˈsaɾ/. castor is at rank #16,007, tagged as anoun, pronounced /kɐsˈtoɾ/.
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 50190, this pair ranks #14,793 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of cassar vs castor
Shared letters: acrs. Private to "cassar": -. Private to "castor": ot.
"cassar" · 6 letters · shape CVCCVC · "castor" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "cassar" for "castor" ever safe?
Which is more common, "cassar" or "castor"?
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 "cassar" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "castor" - compare definitions side by side with the headword page. Word entry
- This pair ranks #14,793 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "cassar" and "castor" also get mixed up with nearby pairs, the highest-scored neighbour is "cassada vs cassar". 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 #14,793 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.