d vs dup, What's the Difference?

Which to use

“d” is a character and “dup” is a verb - they look or sound alike but fill different roles in a sentence.

#327
“d” frequency rank: #28,177
“dup” frequency rank: 28504
confusion score

Side-by-Side Comparison

Feature	d	dup
Definition	The fourth letter of the English alphabet, called dee and written in the Latin script.	to open (a door, gate etc.)

Where the spellings diverge

Shared letters are muted; the letters that actually set d and dup apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.

1 ch

3 ch

dup

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: d is /diː/ while dup is /dʌp/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “d” sits inside “dup”, and the parts of speech differ too (character vs verb), which is usually the fastest check. Our composite confusion score for this pair is 28504, derived from the frequency rank of both members and their visual similarity.

d is recorded at frequency rank #327, classified as acharacter, pronounced /diː/. dup is at rank #28,177, tagged as averb, pronounced /dʌp/.

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 28504, this pair ranks #370,540 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of d vs dup

Shared letters: d. Private to "d": -. Private to "dup": pu.

"d" · 1 letters · shape C · "dup" · 3 letters · shape CVC

Frequency comparison

d#327

dup#28,177

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "d" and "dup" be used interchangeably?

No - they are not even the same part of speech. "d" is a character and "dup" a verb, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "d" or "dup"?

"d" is the more common of the two: it sits at frequency rank #327 in our English list, against #28,177 for "dup". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering d vs dup

The fastest way to pick the right one every time.

Check the role first: if you need a character, it's “d”; for a verb, it's “dup”.
See each word in full, definition, IPA, etymology and its other confusables. Full “d” entry
Browse more pairs most likely to be confused. Most confusable