FSI
The verdict
“FSI” is uncommon French (frequency #75,712 among 137,178 “F” headwords), classed as a noun. The kind of spelling people second-guess.
- #75,712
- frequency rank, French
- 137,178
- “F” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Forces de sécurité intérieures, ensemble des forces destinées à assurer la sécurité à l’intérieur d’un pays (entre autres la police).
| Property | Value |
|---|---|
| Headword | FSI |
| Language | French |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #75,712 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “FSI” sits in French frequency
Rare enough to double-check
FSI is uncommon French at frequency #75,712 among 137,178 “F” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "Forces de sécurité intérieures, ensemble des forces destinées à assurer la sécurité à l’intérieur d’un pays (entre autres la police).".
The misspelling generator found no plausible variants for FSI, suggesting the orthography follows predictable French patterns. Our dataset records no confusable match here, since its spelling is unusual enough that it doesn't cluster with a lookalike.
This entry's etymology isn't recorded, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct French form is FSI, spelled F-S-I.
Definition
- 1Forces de sécurité intérieures, ensemble des forces destinées à assurer la sécurité à l’intérieur d’un pays (entre autres la police).
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 French corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “FSI”
The practical upshot for anyone who landed here from a spell-check.
- The one correct French spelling is F-S-I - every other letter order is a misspelling in standard orthography.
- Browse more French words and confusable pairs in the same reference. French words
Other uncommon French words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.