Which to use
“def” is an adjective and “duo” is a noun - they look or sound alike but fill different roles in a sentence.
- #32,132
- “def” frequency rank
- #15,317
- “duo” frequency rank
- 47449
- confusion score
Side-by-Side Comparison
| Feature | def | duo |
|---|---|---|
| Definition | algo muito bom | grupo de duas pessoas que atuam conjuntamente |
Where the eye mixes def and duo
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between def and duo
These two trip readers on the page rather than in the ear: def is /dɛf/ while duo is [du.o], Plural: [du.os]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 47449, derived from the frequency rank of both members and their visual similarity.
def is recorded at frequency rank #32,132, classified as anadj, pronounced /dɛf/. duo is at rank #15,317, tagged as anoun, pronounced [du.o], Plural: [du.os].
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 47449, this pair ranks #17,800 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of def vs duo
Shared letters: d. Private to "def": ef. Private to "duo": ou.
"def" · 3 letters · shape CVC · "duo" · 3 letters · shape CVV
Frequently Asked Questions
Is swapping "def" for "duo" ever safe?
Frequency check: "def" vs "duo" - which ranks higher?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "def" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "duo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #17,800 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "def" and "duo" also get mixed up with nearby pairs, the highest-scored neighbour is "dat vs def". Nearby pair
Confusion rank #17,800 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.