Which to use
“duc” and “dud” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,966
- “duc” frequency rank
- #29,251
- “dud” frequency rank
- 66217
- confusion score
Side-by-Side Comparison
| Feature | duc | dud |
|---|---|---|
| Definition | A French duke. | A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile. |
Letter map: duc vs dud
Shared letters muted; letters that set duc and dud apart highlighted. Shared run: 2.
Spelling & dictionary notes on duc vs dud
duc and dud are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by a single letter - c in “duc” becomes d in “dud”. Our composite confusion score for this pair is 66217, derived from the frequency rank of both members and their visual similarity.
duc is recorded at frequency rank #36,966, classified as anoun. dud is at rank #29,251, tagged as anoun, pronounced /dʌd/.
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 66217, this pair ranks #69,028 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of duc vs dud
Shared letters: du. Private to "duc": c. Private to "dud": -.
"duc" · 3 letters · shape CVC · "dud" · 3 letters · shape CVC
Frequently Asked Questions
Can "duc" and "dud" be used interchangeably?
Frequency check: "duc" vs "dud" - which ranks higher?
Useful next steps
Done with this confusable. These links stay specific to "duc" and "dud".
- Full dictionary entry for "duc" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "dud" - compare definitions side by side with the headword page. Word entry
- This pair ranks #69,028 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "duc" and "dud" also get mixed up with nearby pairs, the highest-scored neighbour is "dox vs duc". Nearby pair
Confusion rank #69,028 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.