CAD
"cad" is a 3-letter English headword indexed on PlainSpell.
The verdict
“CAD” is a moderately-common English word, ranked #16,858 in English word frequency and used as a noun.
- #16,858
- frequency rank, English
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Acronym of computer-aided design.
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 | CAD |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #16,858 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “CAD” sits in English frequency
Spelling & Dictionary Insight
The English entry for CAD is 3 letters long, classified as a noun. Corpus data places it at rank #16,858 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 9 distinct senses for this headword, so context determines which meaning a reader should apply.
Our edit-distance generator produced no likely misspellings for CAD, since its letter sequence doesn't invite the usual edit-distance slips. It also participates in 20 confusable-pair relationships, "co", "CD", "CM", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
No explicit etymology string is stored 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 CAD, spelled C-A-D.
Definition
- 1Acronym of computer-aided design.
- 2Initialism of computer-aided drafting.
- 3Initialism of control alt delete.
- 4Initialism of cash against documents, an arrangement where the purchaser must pay the total price in cash in order to get shipping papers from the seller or (usually) a third party.
- 5Initialism of coronary artery disease.
- 6Initialism of computer-aided diagnosis.
- 7Initialism of cold agglutinin disease.
- 8Initialism of computer-aided dispatch.
- 9Initialism of caspase-activated DNase.
Synonyms
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 “CAD”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-A-D - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “co” - see the side-by-side comparison. CAD vs co
- 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.