CO2
[ˌt͡seːoˈt͡svaɪ̯]
The verdict
“CO2” is a regularly-used German word, ranked #4,186 in German word frequency and used as a noun.
- #4,186
- frequency rank, German
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - chemische Summenformel von Kohlendioxid
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | CO2 |
| Language | German |
| Part of speech | Noun |
| IPA | [ˌt͡seːoˈt͡svaɪ̯] |
| Letters | 3 |
| Frequency rank | #4,186 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “CO2” sits in German frequency
Spelling & Dictionary Insight
The German entry for CO2 is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as [ˌt͡seːoˈt͡svaɪ̯]. Corpus data places it at rank #4,186 in overall German word frequency, indicating it appears regularly in written and spoken text. The dominant gloss from Wiktionary reads: "chemische Summenformel von Kohlendioxid".
Our edit-distance generator produced no likely misspellings for CO2, typically a sign the spelling maps closely to how the word sounds. It also participates in 20 confusable-pair relationships, "CT", "Cs", "Cr", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Our source data has no etymology on file for this entry, leaving phoneme-to-grapheme mapping as the best guide to its spelling rather than a borrowing history. The correct German form is CO2, spelled C-O-2.
Definition
- 1chemische Summenformel von Kohlendioxid
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 German corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “CO2”
The practical upshot for anyone who landed here from a spell-check.
- The one correct German spelling is C-O-2 - every other letter order is a misspelling in standard orthography.
- Say it as [ˌt͡seːoˈt͡svaɪ̯] (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “CT” - see the side-by-side comparison. CO2 vs CT
- Browse more German words and confusable pairs in the same reference. German words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.