CDO
"cdo" is a 3-letter English headword indexed on PlainSpell.
The verdict
“CDO” is uncommon English (frequency #55,312 among 43,570 “C” headwords), classed as a noun. The kind of spelling people second-guess.
- #55,312
- frequency rank, English
- 43,570
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of collateralized debt obligation.
Corpus desk
Index EN-cdo · CDO · English
CDO · rank #55,312 · 0 variants · 0 confusables
- FREQ-RARE #55,312
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 43,570
- PHOTO-FINISH CBF
Nearest frequency peer: CBF (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbourhood for “CDO”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- cartographic
cartographic
44,693 corpus weight
- Caswell
Caswell
44,691 corpus weight
- CBF
CBF
44,690 corpus weight
- CDO
CDO
44,689 corpus weight
- certiorari
certiorari
44,688 corpus weight
- ceviche
ceviche
44,686 corpus weight
What this shows Bars show where “CDO” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | CDO |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #55,312 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “CDO” sits in English frequency
Rare enough to double-check
CDO is uncommon English at frequency #55,312 among 43,570 “C” headwords, classed as anoun. Rarity is why readers land here mid-draft. 3 senses are on record.
No misspelling variants are generated for CDO in our index, which points to an orthography that plays by predictable English rules. Our dataset records no confusable match here, since nothing in our dataset looks or sounds close enough to cause mix-ups.
No documented word history exists for this headword, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct English form is CDO, spelled C-D-O.
Definition
- 1Initialism of collateralized debt obligation.
- 2Initialism of command duty officer.
- 3Initialism of chief data officer.
Recorded use
Wiktionary examplesThese source excerpts show how CDO appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The problem is that the connection between subprime default rates, on the one hand, and CDO valuations and default rates, on the other, is so complex that it's very difficult to say in a simple sense that a rise in mortgage defaults will lead to a rise in CDO defaults.
These CDOs had been so sliced and diced that it was possible to claim that a tier of the interest payments from the original borrowers was as dependable as a stream of income on a ten-year US Treasury bond, and therefore worthy of a coveted triple-A rating.
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 English corpus, MIT). See the methodology for how each field is sourced and updated.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "CDO", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).
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.