FCO vs FDA, What's the Difference?

Which to use

“FCO” and “FDA” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#49,916
“FCO” frequency rank: #8,665
“FDA” frequency rank: 58581
confusion score

Side-by-Side Comparison

Feature	FCO	FDA
Definition	Initialism of Foreign and Commonwealth Office.	Initialism of Food and Drug Administration, a United States federal regulatory body.

Letter map: FCO vs FDA

Shared letters muted; letters that set FCO and FDA apart highlighted. Shared run: 1.

3 ch

FCO

3 ch

FDA

Corpus notes: FCO and FDA

FCO and FDA are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 58581, derived from the frequency rank of both members and their visual similarity.

FCO is recorded at frequency rank #49,916, classified as aname. FDA is at rank #8,665, tagged as aname.

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 58581, this pair ranks #111,635 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of FCO vs FDA

Shared letters: f. Private to "FCO": co. Private to "FDA": ad.

"FCO" · 3 letters · shape CCV · "FDA" · 3 letters · shape CCV

Frequently Asked Questions

Do "FCO" and "FDA" mean the same thing in a sentence?

No. They share most of their letters but differ in 2 positions, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

In ordinary English text, does "FCO" or "FDA" show up more?

"FDA" is the more common of the two: it sits at frequency rank #8,665 in our English list, against #49,916 for "FCO". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "FCO" and "FDA".

Full dictionary entry for "FCO" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "FDA" - compare definitions side by side with the headword page. Word entry
This pair ranks #111,635 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"FCO" and "FDA" also get mixed up with nearby pairs, the highest-scored neighbour is "FCO vs FOMO". Nearby pair

Confusion rank #111,635 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.