duo
/ˈdjuː.əʊ/
"duo" is a 3-letter English headword indexed on PlainSpell.
The verdict
“duo” is a regularly-used English word, ranked #6,234 in English word frequency and used as a noun.
- #6,234
- frequency rank, English
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Two people who work or collaborate together as partners; especially
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 | duo |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈdjuː.əʊ/ |
| Letters | 3 |
| Frequency rank | #6,234 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “duo” sits in English frequency
Spelling & Dictionary Insight
The English entry for duo is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈdjuː.əʊ/. Corpus data places it at rank #6,234 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.
Our edit-distance generator produced no likely misspellings for duo, and the word's spelling is regular enough that our generator found nothing worth flagging. It also participates in 20 confusable-pair relationships, "dw", "Dx", "DV", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: PIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic. The correct English form is duo, spelled D-U-O.
Definition
- 1Two people who work or collaborate together as partners; especially
- 2Two people who work or collaborate together as partners; especially:
- 3Any pair of people.
- 4Any cocktail consisting of a spirit and a liqueur.
- 5A meal with two paired components.
- 6A song in two parts; a duet.
Etymology
PIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic.
This word in other languages
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 “duo”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is D-U-O - every other letter order is a misspelling in standard orthography.
- Say it as /ˈdjuː.əʊ/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “dw” - see the side-by-side comparison. duo vs dw
- 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.