CTO
"cto" is a 3-letter English headword indexed on PlainSpell.
The verdict
“CTO” is a moderately-common English word, ranked #33,598 in English word frequency and used as a noun.
- #33,598
- frequency rank, English
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of chief technology officer or chief technical officer.
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 | CTO |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #33,598 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “CTO” sits in English frequency
Spelling & Dictionary Insight
The English entry for CTO is 3 letters long, classified as a noun. Corpus data places it at rank #33,598 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.
CTO doesn't appear in our generated misspelling index, a straightforward case of a spelling with little room for common typos. It also participates in 20 confusable-pair relationships, "CV", "CU", "CW", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
No borrowing history is documented for this entry, so any spelling logic here comes from how the word's sounds map to letters, not a documented origin story. The correct English form is CTO, spelled C-T-O.
Definition
- 1Initialism of chief technology officer or chief technical officer.
- 2Initialism of confidential treatment order.
- 3Initialism of chronic total occlusion.
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.
Frequently Asked Questions
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Using “CTO”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-T-O - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “CV” - see the side-by-side comparison. CTO vs CV
- Browse more English words and confusable pairs in the same reference. English 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.