ubi vs un, What's the Difference?

Which to use

“ubi” is an adverb and “un” is an adjective - they look or sound alike but fill different roles in a sentence.

#42,101
“ubi” frequency rank: #12
“un” frequency rank: 42113
confusion score

Side-by-Side Comparison

Feature	ubi	un
Definition	Où, en quel endroit.	Marque l’unité, le fait qu’une personne ou une chose est seule, unique en son espèce.

Where the spellings diverge

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

3 ch

ubi

2 ch

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: ubi is \ˈu.biː\ while un is \œ̃\. 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 (adverb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 42113, derived from the frequency rank of both members and their visual similarity.

ubi is recorded at frequency rank #42,101, classified as anadv, pronounced \ˈu.biː\. un is at rank #12, tagged as anadj, pronounced \œ̃\.

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 42113, this pair ranks #228,127 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ubi vs un

Shared letters: u. Private to "ubi": bi. Private to "un": n.

"ubi" · 3 letters · shape VCV · "un" · 2 letters · shape VC

Frequency comparison

ubi#42,101

un#12

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "ubi" and "un" be used interchangeably?

No - they are not even the same part of speech. "ubi" is an adverb and "un" an adjective, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "ubi" or "un"?

"un" is the more common of the two: it sits at frequency rank #12 in our French list, against #42,101 for "ubi". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering ubi vs un

The fastest way to pick the right one every time.

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