Which to use
“sub” is a preposition and “sud” is a noun - they look or sound alike but fill different roles in a sentence.
- #10,413
- “sub” frequency rank
- #439
- “sud” frequency rank
- 10852
- confusion score
Side-by-Side Comparison
| Feature | sub | sud |
|---|---|---|
| Definition | Préposition latine, qui s’emploie dans des locutions telles que : | Point cardinal opposé au nord ; direction du pôle de l’hémisphère austral et correspondant à l’azimut 180°. |
Where the spellings diverge
Shared letters are muted; the letters that actually set sub and sud apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
sub and sud form a confusable pair in the French index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - b in “sub” becomes d in “sud” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 10852, derived from the frequency rank of both members and their visual similarity.
sub is recorded at frequency rank #10,413, classified as aprep, pronounced \syb\. sud is at rank #439, tagged as anoun, pronounced \syd\.
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 10852, this pair ranks #411,426 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Frequency comparison
Frequently Asked Questions
Can "sub" and "sud" be used interchangeably?
Remembering sub vs sud
The fastest way to pick the right one every time.
- Check the role first: if you need a preposition, it's “sub”; for a noun, it's “sud”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “sub” entry
- Browse more pairs most likely to be confused. Most confusable