foo vs foy, What's the Difference?

Which to use

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

#18,562
“foo” frequency rank: #36,566
“foy” frequency rank: 55128
confusion score

Side-by-Side Comparison

Feature	foo	foy
Definition	Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions.	Faith, allegiance.

Letter map: foo vs foy

Shared letters muted; letters that set foo and foy apart highlighted. Shared run: 2.

3 ch

foo

3 ch

foy

Spelling & dictionary notes on foo vs foy

foo and foy 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 differ by a single letter - o in “foo” becomes y in “foy”. Our composite confusion score for this pair is 55128, derived from the frequency rank of both members and their visual similarity.

foo is recorded at frequency rank #18,562, classified as anoun, pronounced /fuː/. foy is at rank #36,566, tagged as anoun.

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 55128, this pair ranks #135,991 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of foo vs foy

Shared letters: fo. Private to "foo": -. Private to "foy": y.

"foo" · 3 letters · shape CVV · "foy" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "foo" for "foy" ever safe?

No. They differ by a single letter - o in “foo” becomes y in “foy”, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Frequency check: "foo" vs "foy" - which ranks higher?

"foo" is the more common of the two: it sits at frequency rank #18,562 in our English list, against #36,566 for "foy". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pair "foo" vs "foy" is on the table, pick a follow-up below.

Full dictionary entry for "foo" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "foy" - compare definitions side by side with the headword page. Word entry
This pair ranks #135,991 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"foo" and "foy" also get mixed up with nearby pairs, the highest-scored neighbour is "FOMO vs foy". Nearby pair

Confusion rank #135,991 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.