sei vs seuil, What's the Difference?

Which to use

“sei” is a verb and “seuil” is a noun - they look or sound alike but fill different roles in a sentence.

#36,154
“sei” frequency rank: #3,364
“seuil” frequency rank: 39518
confusion score

Side-by-Side Comparison

Feature	sei	seuil
Definition	Deuxième personne du singulier de l’impératif présent de sein.	Pièce de bois ou dalle de pierre qui est au bas de l’ouverture d’une porte qui l’affleure.

Where the spellings diverge

Shared letters are muted; the letters that actually set sei and seuil apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

3 ch

sei

5 ch

seuil

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: sei is \zaɪ̯\ while seuil is \sœj\. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 39518, derived from the frequency rank of both members and their visual similarity.

sei is recorded at frequency rank #36,154, classified as averb, pronounced \zaɪ̯\. seuil is at rank #3,364, tagged as anoun, pronounced \sœj\.

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 39518, this pair ranks #247,357 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of sei vs seuil

Shared letters: eis. Private to "sei": -. Private to "seuil": lu.

"sei" · 3 letters · shape CVV · "seuil" · 5 letters · shape CVVVC

Known mistypes of this pair

seuil ← esuil · seiul · seuill · seuli · sseuil · sueil

Frequency comparison

sei#36,154

seuil#3,364

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sei" and "seuil" be used interchangeably?

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

Which is more common, "sei" or "seuil"?

"seuil" is the more common of the two: it sits at frequency rank #3,364 in our French list, against #36,154 for "sei". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering sei vs seuil

The fastest way to pick the right one every time.

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