Which to use
“radon” and “reason” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #33,384
- “radon” frequency rank
- #479
- “reason” frequency rank
- 33863
- confusion score
Side-by-Side Comparison
| Feature | radon | reason |
|---|---|---|
| Definition | The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. | A cause: |
Where the eye mixes radon and reason
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Why the eye confuses radon with reason
A purely visual mix-up. radon (/ˈɹeɪdɒn/) and reason (/ˈɹiː.zən/) 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 1 letter(s) in length. Our composite confusion score for this pair is 33863, derived from the frequency rank of both members and their visual similarity.
radon is recorded at frequency rank #33,384, classified as anoun, pronounced /ˈɹeɪdɒn/. reason is at rank #479, tagged as anoun, pronounced /ˈɹiː.zən/.
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 33863, this pair ranks #325,744 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of radon vs reason
Shared letters: anor. Private to "radon": d. Private to "reason": es.
"radon" · 5 letters · shape CVCVC · "reason" · 6 letters · shape CVVCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "radon" for "reason" ever safe?
Frequency check: "radon" vs "reason" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "radon" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "reason" - compare definitions side by side with the headword page. Word entry
- This pair ranks #325,744 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "radon" and "reason" also get mixed up with nearby pairs, the highest-scored neighbour is "radon vs ripon". 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 #325,744 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.