Which to use
“ub” is a noun and “ubi” is an adverb - they look or sound alike but fill different roles in a sentence.
- #41,579
- “ub” frequency rank
- #42,101
- “ubi” frequency rank
- 83680
- confusion score
Side-by-Side Comparison
| Feature | ub | ubi |
|---|---|---|
| Definition | Eau. | Où, en quel endroit. |
Where the eye mixes ub and ubi
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. ub runs 2 letters (VC) against ubi's 3 (VCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses ub with ubi
These two trip readers on the page rather than in the ear: ub is \u˧˥\ while ubi is \ˈu.biː\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 extra letter(s) - “ub” sits inside “ubi”, and the parts of speech differ too (noun vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 83680, derived from the frequency rank of both members and their visual similarity.
ub is recorded at frequency rank #41,579, classified as anoun, pronounced \u˧˥\. ubi is at rank #42,101, tagged as anadv, pronounced \ˈu.biː\.
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 83680, this pair ranks #14,381 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of ub vs ubi
Shared letters: bu. Private to "ub": -. Private to "ubi": i.
"ub" · 2 letters · shape VC · "ubi" · 3 letters · shape VCV
Frequently Asked Questions
Is swapping "ub" for "ubi" ever safe?
Frequency check: "ub" vs "ubi" - which ranks higher?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "ub" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ubi" - compare definitions side by side with the headword page. Word entry
- This pair ranks #14,381 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ub" and "ubi" also get mixed up with nearby pairs, the highest-scored neighbour is "ubi vs Ubu". Nearby pair
Confusion rank #14,381 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.