FCI
"fci" is a 3-letter English headword indexed on PlainSpell.
The verdict
“FCI” is uncommon English (frequency #81,318 among 18,613 “F” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #81,318
- frequency rank, English
- 18,613
- “F” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of Federal Correctional Institutions.
Corpus desk
Index EN-fci · FCI · English
FCI · rank #81,318 · 0 variants · 0 confusables
- FREQ-RARE #81,318
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 18,613
- PHOTO-FINISH faxing
Nearest frequency peer: faxing (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbourhood for “FCI”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- facultative
facultative
18,687 corpus weight
- Fairlie
Fairlie
18,686 corpus weight
- Fajardo
Fajardo
18,685 corpus weight
- faxing
faxing
18,684 corpus weight
- FCI
FCI
18,683 corpus weight
- Ferranti
Ferranti
18,680 corpus weight
What this shows Bars show where “FCI” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | FCI |
| Language | English |
| Part of speech | Proper noun |
| Letters | 3 |
| Frequency rank | #81,318 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “FCI” sits in English frequency
Rare enough to double-check
FCI is uncommon English at frequency #81,318 among 18,613 “F” headwords, classed as aproper noun. Rarity is why readers land here mid-draft. 2 senses are on record.
We couldn't generate a plausible misspelling set for FCI, which points to an orthography that plays by predictable English rules. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.
No borrowing history is documented for this entry, so spelling patterns must be inferred from the word's phoneme-to-grapheme mapping rather than from a documented borrowing chain. The correct English form is FCI, spelled F-C-I.
Definition
- 1Initialism of Federal Correctional Institutions.
- 2Initialism of Finance, Competitiveness and Innovation.
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 English corpus, MIT). See the methodology for how each field is sourced and updated.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "FCI", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency 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.