Which to use
“clou” and “CO2” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #39,272
- “clou” frequency rank
- #4,186
- “CO2” frequency rank
- 43458
- confusion score
Side-by-Side Comparison
| Feature | clou | CO2 |
|---|---|---|
| Definition | Nagel | chemische Summenformel von Kohlendioxid |
Where the eye mixes clou and CO2
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses clou with CO2
A purely visual mix-up. clou ([klu]) and CO2 ([ˌt͡seːoˈt͡svaɪ̯]) 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 1 letter(s) in length. Our composite confusion score for this pair is 43458, derived from the frequency rank of both members and their visual similarity.
clou is recorded at frequency rank #39,272, classified as anoun, pronounced [klu]. CO2 is at rank #4,186, tagged as anoun, pronounced [ˌt͡seːoˈt͡svaɪ̯].
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 43458, this pair ranks #1,417,470 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of clou vs CO2
Shared letters: co. Private to "clou": lu. Private to "CO2": -.
"clou" · 4 letters · shape CCVV · "CO2" · 2 letters · shape CV
Known mistypes of this pair
- clou ← cclou · cllou · cluo · colu · lcou
Frequently Asked Questions
Do "clou" and "CO2" mean the same thing in a sentence?
Which is more common, "clou" or "CO2"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "clou" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "CO2" - compare definitions side by side with the headword page. Word entry
- This pair ranks #1,417,470 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "clou" and "CO2" also get mixed up with nearby pairs, the highest-scored neighbour is "clock vs clou". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #1,417,470 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.