Which to use
“adder” and “alder” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #41,977
- “adder” frequency rank
- #29,902
- “alder” frequency rank
- 71879
- confusion score
Side-by-Side Comparison
| Feature | adder | alder |
|---|---|---|
| Definition | Any snake. | Any of several trees or shrubs of the genus Alnus, belonging to the birch family. |
Where the eye mixes adder and alder
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. adder and alder follow the identical consonant-vowel pattern (VCCVC). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between adder and alder
A purely visual mix-up. adder (/ˈædɚ/) and alder (/ˈɔːldə/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - d in “adder” becomes l in “alder”. Our composite confusion score for this pair is 71879, 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/. alder is at rank #29,902, tagged as anoun, pronounced /ˈɔːldə/.
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 71879, this pair ranks #45,028 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of adder vs alder
Shared letters: ader. Private to "adder": -. Private to "alder": l.
"adder" · 5 letters · shape VCCVC · "alder" · 5 letters · shape VCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "adder" for "alder" ever safe?
Frequency check: "adder" vs "alder" - 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 "adder" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "alder" - compare definitions side by side with the headword page. Word entry
- This pair ranks #45,028 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "adder" and "alder" 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 #45,028 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.