FCO
"fco" is a 3-letter English headword indexed on PlainSpell.
The verdict
“FCO” sits in 20 confusable pairs (corpus #49,916) as a proper noun. The look-alike neighbours are the real trap.
- #49,916
- frequency rank, English
- 18,613
- “F” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of Foreign and Commonwealth Office.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | FCO |
| Language | English |
| Part of speech | Proper noun |
| Letters | 3 |
| Frequency rank | #49,916 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “FCO” sits in English frequency
Easy to mix with look-alikes
The spelling risk for FCO is neighbouring look-alikes ("fi", "FL", …), not just typos; it is aproper noun. Frequency #49,916 among 18,613 “F” headwords. Gloss: "Initialism of Foreign and Commonwealth Office.".
Our edit-distance generator produced no likely misspellings for FCO, a straightforward case of a spelling with little room for common typos. It also participates in 20 confusable-pair relationships, "fi", "FL", "FM", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
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 FCO, spelled F-C-O.
Definition
- 1Initialism of Foreign and Commonwealth Office.
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.
Frequently Asked Questions
How do you spell "FCO"?
What does "FCO" mean?
What words are commonly confused with "FCO"?
What language does "FCO" come from?
Is PlainSpell free to use?
Using “FCO”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-C-O - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “fi” - see the side-by-side comparison. FCO vs fi
- Browse more English words and confusable pairs in the same reference. English words
Words at a similar English frequency
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.