fog vs foo, What's the Difference?

Which to use

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

#46,768
“fog” frequency rank: #43,447
“foo” frequency rank: 90215
confusion score

Side-by-Side Comparison

Feature	fog	foo
Definition	Brouillard, brume.	Variable métasyntaxique en programmation informatique.

Where the eye mixes fog and foo

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. fog (CVC) and foo (CVV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.

3 ch

fog

3 ch

foo

Look-alike desk: fog vs foo

A purely visual mix-up. fog (\fɔɡ\) and foo (\fu\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - g in “fog” becomes o in “foo”. Our composite confusion score for this pair is 90215, derived from the frequency rank of both members and their visual similarity.

fog is recorded at frequency rank #46,768, classified as anoun, pronounced \fɔɡ\. foo is at rank #43,447, tagged as anoun, pronounced \fu\.

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 90215, this pair ranks #5,007 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of fog vs foo

Shared letters: fo. Private to "fog": g. Private to "foo": -.

"fog" · 3 letters · shape CVC · "foo" · 3 letters · shape CVV

Frequently Asked Questions

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

No. They are said differently (\fɔɡ\ versus \fu\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

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

"foo" is the more common of the two: it sits at frequency rank #43,447 in our French list, against #46,768 for "fog". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Eye-level mix-up between "fog" and "foo" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "fog" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "foo" - compare definitions side by side with the headword page. Word entry
This pair ranks #5,007 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"fog" and "foo" also get mixed up with nearby pairs, the highest-scored neighbour is "Fee vs fog". Nearby pair

Confusion rank #5,007 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.