Which to use
“adder” is a noun and “adieu” is an intj - they look or sound alike but fill different roles in a sentence.
- #41,977
- “adder” frequency rank
- #35,604
- “adieu” frequency rank
- 77581
- confusion score
Side-by-Side Comparison
| Feature | adder | adieu |
|---|---|---|
| Definition | Any snake. | Said to wish a final farewell; goodbye. |
Where the eye mixes adder and adieu
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Look-alike desk: adder vs adieu
These two trip readers on the page rather than in the ear: adder is /ˈædɚ/ while adieu is /əˈdju/. 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 (noun vs intj), which is usually the fastest check. Our composite confusion score for this pair is 77581, derived from the frequency rank of both members and their visual similarity.
adder is recorded at frequency rank #41,977, classified as anoun, pronounced /ˈædɚ/. adieu is at rank #35,604, tagged as anintj, pronounced /əˈdju/.
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 77581, this pair ranks #26,861 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of adder vs adieu
Shared letters: ade. Private to "adder": r. Private to "adieu": iu.
"adder" · 5 letters · shape VCCVC · "adieu" · 5 letters · shape VCVVV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "adder" for "adieu" ever safe?
Which is more common, "adder" or "adieu"?
What to do next
Eye-level mix-up between "adder" and "adieu" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "adder" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "adieu" - compare definitions side by side with the headword page. Word entry
- This pair ranks #26,861 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "adder" and "adieu" also get mixed up with nearby pairs, the highest-scored neighbour is "adder vs adverb". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #26,861 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.