foi vs Fs, What's the Difference?

Which to use

“foi” and “Fs” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#1,478
“foi” frequency rank: #28,962
“Fs” frequency rank: 30440
confusion score

Side-by-Side Comparison

Feature	foi	Fs
Definition	Croyance aux dogmes de la religion, en Dieu.	Pluriel de F.

Where the eye mixes foi and Fs

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

foi

2 ch

Visual trap between foi and Fs

A purely visual mix-up. foi (\fwa\) and Fs (\ɛfs\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 30440, derived from the frequency rank of both members and their visual similarity.

foi is recorded at frequency rank #1,478, classified as anoun, pronounced \fwa\. Fs is at rank #28,962, tagged as anoun, pronounced \ɛfs\.

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 30440, this pair ranks #310,319 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of foi vs Fs

Shared letters: f. Private to "foi": io. Private to "Fs": s.

"foi" · 3 letters · shape CVV · "Fs" · 2 letters · shape CC

Frequently Asked Questions

Do "foi" and "Fs" mean the same thing in a sentence?

No. They are said differently (\fwa\ versus \ɛfs\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Frequency check: "foi" vs "Fs" - which ranks higher?

"foi" is the more common of the two: it sits at frequency rank #1,478 in our French list, against #28,962 for "Fs". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "foi" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Fs" - compare definitions side by side with the headword page. Word entry
This pair ranks #310,319 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"foi" and "Fs" also get mixed up with nearby pairs, the highest-scored neighbour is "Fee vs Fs". Nearby pair

Confusion rank #310,319 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.