Which to use
“castor” and “custom” are a confusable Portuguese pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #16,007
- “castor” frequency rank
- #27,822
- “custom” frequency rank
- 43829
- confusion score
Side-by-Side Comparison
| Feature | castor | custom |
|---|---|---|
| Definition | roedor semi-aquáticos da família Castoridae, nativo da América do Norte e da Europa | costume, hábito |
Where the eye mixes castor and custom
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Look-alike desk: castor vs custom
A purely visual mix-up. castor (/kɐsˈtoɾ/) and custom (/kʌstəm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 43829, derived from the frequency rank of both members and their visual similarity.
castor is recorded at frequency rank #16,007, classified as anoun, pronounced /kɐsˈtoɾ/. custom is at rank #27,822, tagged as anoun, pronounced /kʌstəm/.
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 43829, this pair ranks #21,751 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of castor vs custom
Shared letters: cost. Private to "castor": ar. Private to "custom": mu.
"castor" · 6 letters · shape CVCCVC · "custom" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Do "castor" and "custom" mean the same thing in a sentence?
Which is more common, "castor" or "custom"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "castor" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "custom" - compare definitions side by side with the headword page. Word entry
- This pair ranks #21,751 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "castor" and "custom" also get mixed up with nearby pairs, the highest-scored neighbour is "cisto vs custom". 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 #21,751 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.