si vs six, What's the Difference?

Which to use

“si” is a conjunction and “six” is a noun - they look or sound alike but fill different roles in a sentence.

#46
“si” frequency rank: #592
“six” frequency rank: 638
confusion score

Side-by-Side Comparison

Feature	si	six
Definition	Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.	(radiotéléphonie) Mot de code radiotéléphonique de l'OACI, OTAN et SIA pour le chiffre 6.

Where the spellings diverge

Shared letters are muted; the letters that actually set si and six apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

2 ch

3 ch

six

Spelling & Dictionary Insight

si and six 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 1 extra letter(s) - “si” sits inside “six” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 638, derived from the frequency rank of both members and their visual similarity.

si is recorded at frequency rank #46, classified as aconj, pronounced \si\. six is at rank #592, tagged as anoun, pronounced \ˈsɪks\.

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 638, this pair ranks #439,348 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Frequency comparison

si#46

six#592

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "si" and "six" be used interchangeably?

No, "si" and "six" have distinct meanings and cannot be swapped without changing the meaning of a sentence. Understanding the specific definition and context for each word is essential for correct usage.

Remembering si vs six

The fastest way to pick the right one every time.

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