Which to use
“Duffy” is a name and “duty” is a noun - they look or sound alike but fill different roles in a sentence.
- #16,897
- “Duffy” frequency rank
- #1,994
- “duty” frequency rank
- 18891
- confusion score
Side-by-Side Comparison
| Feature | Duffy | duty |
|---|---|---|
| Definition | A surname from Irish, an anglicization of Ó Dubhthaigh (“descendant of Dubhthach”). Dubhthach is a byname derived from dubh (“black”). | That which one is morally or legally obligated to do. |
Where the spellings diverge
Shared letters are muted; the letters that actually set Duffy and duty apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: Duffy is /ˈdʌfi/ while duty is /ˈdjuː.ti/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (name vs noun), which is usually the fastest check. Our composite confusion score for this pair is 18891, derived from the frequency rank of both members and their visual similarity.
Duffy is recorded at frequency rank #16,897, classified as aname, pronounced /ˈdʌfi/. duty is at rank #1,994, tagged as anoun, pronounced /ˈdjuː.ti/.
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 18891, this pair ranks #441,907 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of Duffy vs duty
Shared letters: duy. Private to "Duffy": f. Private to "duty": t.
"Duffy" · 5 letters · shape CVCCV · "duty" · 4 letters · shape CVCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "Duffy" and "duty" be used interchangeably?
Which is more common, "Duffy" or "duty"?
Remembering Duffy vs duty
The fastest way to pick the right one every time.
- Check the role first: if you need a name, it's “Duffy”; for a noun, it's “duty”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “Duffy” entry
- Browse more pairs most likely to be confused. Most confusable