radon

/ˈɹeɪdɒn/

//ˈɹeɪdɒn// noun

By · According to Wiktionary data (CC BY-SA) ·

"radon" is a 5-letter English headword indexed on PlainSpell.

The verdict

“radon” has 7 generated spelling variants in the English index at frequency #33,384. The variants make it a useful spelling check.

#33,384
frequency rank, English
3,094
“R” headwords
7
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.

Corpus desk

Index EN-radon · radon · English

radon · rank #33,384 · 7 variants · 20 confusables

  • FREQ-MID #33,384
  • LEN-MID 5 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-MID 7 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH radicalism

Nearest frequency peer: radicalism (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “radon”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “radon” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

radon vs ran
60% similar
radon vs Ron
40% similar
radon vs Rao
40% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for radon
PropertyValue
Headwordradon
LanguageEnglish
Part of speechNoun
IPA/ˈɹeɪdɒn/
Letters5
Frequency rank#33,384
Misspellings tracked7
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “radon”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).radonlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “radicalism” (#33,383), “rationalize” (#33,386), “quench” (#33,381). Among 3,094 “R” headwords, “radon” is #33,384. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 7 spelling variants around radon (IPA /ˈɹeɪdɒn/), anoun. Corpus frequency is #33,384 among 3,094 “R” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 7 likely wrong-spelling variants for radon, with forms such as "ardon", "raddon", and "radno". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 20 confusable-pair relationships, "ran", "Ron", "Rao", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”). The correct English form is radon, spelled R-A-D-O-N.

Definition

  1. 1
    The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
  2. 2
    Radon-222 (22286Rn), the most stable isotope of said element.

Etymology

Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).

Synonyms

emanationnitonexradioradeonradium emanation

This word in other languages

radón(Español)radon(Français)Radon(Deutsch)rádon(Português)

Common misspellings

Also misspelled as:

  • ardon
  • raddon
  • radno
  • radonn
  • raodn
  • rdaon
  • rradon

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of radon - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

ardon2raddon1radno2radonn1raodn2rdaon2rradon1
Edit distance from "radon"

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

How do you spell "radon"?
"radon" is spelled R-A-D-O-N. The IPA pronunciation is /ˈɹeɪdɒn/.
What does "radon" mean?
As a noun, "radon" means: The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
What words are commonly confused with "radon"?
"radon" is commonly confused with "ran", "Ron", "Rao". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "radon"?
The IPA (International Phonetic Alphabet) transcription for "radon" is /ˈɹeɪdɒn/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "radon"?
Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "radon", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 5 letters (nearest by frequency rank).

putty#33,380Powys#33,372ponce#33,370Pitts#33,365

Similar misspelling depth

Headwords with a similar count of attested misspellings (7 here; floor ≥5).

Sacha7 variantspanes7 variantsopiate7 variantsmirza7 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list