filsvsFLNWhat's the difference?

Which to use

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

#337
“fils” frequency rank
#21,323
“FLN” frequency rank
21660
confusion score

Side-by-Side Comparison

Feature fils FLN
Definition Tout être humain de genre masculin considéré par rapport à son père et à sa mère, ou à un des deux seulement. Mouvement indépendantiste algérien.

Where the eye mixes fils and FLN

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
fils
3 ch
FLN

Look-alike desk: fils vs FLN

A purely visual mix-up. fils (\fis\) and FLN (\ɛf.ɛl.ɛn\) 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 21660, derived from the frequency rank of both members and their visual similarity.

fils is recorded at frequency rank #337, classified as anoun, pronounced \fis\. FLN is at rank #21,323, tagged as anoun, pronounced \ɛf.ɛl.ɛn\.

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 21660, this pair ranks #362,073 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of fils vs FLN

Shared letters: fl. Private to "fils": is. Private to "FLN": n.

"fils" · 4 letters · shape CVCC  ·  "FLN" · 3 letters · shape CCC

Known mistypes of this pair

  • filsffils · fills · filss · fisl · flis · ifls

Frequently Asked Questions

Is swapping "fils" for "FLN" ever safe?
No. They are said differently (\fis\ versus \ɛf.ɛl.ɛn\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Which is more common, "fils" or "FLN"?
"fils" is the more common of the two: it sits at frequency rank #337 in our French list, against #21,323 for "FLN". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

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

  • Full dictionary entry for "fils" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "FLN" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #362,073 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "fils" and "FLN" also get mixed up with nearby pairs, the highest-scored neighbour is "Fee vs FLN". Nearby pair
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #362,073 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list