f vs fou, What's the Difference?

Which to use

“f” is a character and “fou” is an adjective - they look or sound alike but fill different roles in a sentence.

#873
“f” frequency rank: #48,244
“fou” frequency rank: 49117
confusion score

Side-by-Side Comparison

Feature	f	fou
Definition	The sixth letter of the English alphabet, called ef and written in the Latin script.	Drunk.

Letter map: f vs fou

Shared letters muted; letters that set f and fou apart highlighted. Shared run: 1.

1 ch

3 ch

fou

Grammar separator: f vs fou

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: f is acharacter and fouanadjective. On the page they differ by 2 extra letter(s) - “f” sits inside “fou”. Our composite confusion score for this pair is 49117, derived from the frequency rank of both members and their visual similarity.

f is recorded at frequency rank #873, classified as acharacter, pronounced /ɛf/. fou is at rank #48,244, tagged as anadj.

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 49117, this pair ranks #186,653 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of f vs fou

Shared letters: f. Private to "f": -. Private to "fou": ou.

"f" · 1 letters · shape C · "fou" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "f" for "fou" ever safe?

No - they are not even the same part of speech. "f" is a character and "fou" an adjective, so a sentence built for one is usually ungrammatical with the other.

In ordinary English text, does "f" or "fou" show up more?

"f" is the more common of the two: it sits at frequency rank #873 in our English list, against #48,244 for "fou". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "f" vs "fou" is on the table, pick a follow-up below.

Full dictionary entry for "f" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "fou" - compare definitions side by side with the headword page. Word entry
This pair ranks #186,653 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"f" and "fou" also get mixed up with nearby pairs, the highest-scored neighbour is "FOMO vs fou". Nearby pair

Confusion rank #186,653 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.