thorium

/ˈθɔːɹiəm/

//ˈθɔːɹiəm// noun

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

"thorium" is a 7-letter English headword indexed on PlainSpell.

The verdict

“thorium” has 10 generated spelling variants in the English index at frequency #37,733. The variants make it a useful spelling check.

#37,733
frequency rank, English
3,151
“T” headwords
10
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.

Corpus desk

Index EN-thorium · thorium · English

thorium · rank #37,733 · 10 variants · 0 confusables

  • FREQ-MID #37,733
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-MID 10 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH terrorize

Nearest frequency peer: terrorize (-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 “thorium”

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

corpus weight

What this shows “thorium” 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
Key facts for thorium
PropertyValue
Headwordthorium
LanguageEnglish
Part of speechNoun
IPA/ˈθɔːɹiəm/
Letters7
Frequency rank#37,733
Misspellings tracked10
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “thorium”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).thoriumlands here:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “terrorize” (#37,732), “throes” (#37,734), “Tiananmen” (#37,735). Among 3,151 “T” headwords, “thorium” is #37,733. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around thorium (IPA /ˈθɔːɹiəm/), anoun. Corpus frequency is #37,733 among 3,151 “T” headwords. Dominant gloss: "A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.".

Our generated misspelling index lists 10 likely wrong-spelling variants for thorium, with forms such as "htorium", "thhorium", and "thoirum". 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. This entry stands alone in our confusable dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From Thor + -ium. The correct English form is thorium, spelled T-H-O-R-I-U-M.

Definition

  1. 1
    A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.

Etymology

From Thor + -ium.

Synonyms

thorinum

This word in other languages

torio(Español)thorium(Français)Thorium(Deutsch)tório(Português)

Common misspellings

Also misspelled as:

  • htorium
  • thhorium
  • thoirum
  • thorimu
  • thoriumm
  • thorrium
  • thoruim
  • throium
  • tohrium
  • tthorium

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of thorium - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

htorium2thhorium1thoirum2thorimu2thoriumm1thorrium1thoruim2throium2
Edit distance from "thorium"

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 "thorium"?
"thorium" is spelled T-H-O-R-I-U-M. The IPA pronunciation is /ˈθɔːɹiəm/.
What does "thorium" mean?
As a noun, "thorium" means: A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.
What are common misspellings of "thorium"?
Common misspellings include "htorium", "thhorium", "thoirum", "thorimu", "thoriumm". The correct spelling is "thorium".
How do you pronounce "thorium"?
The IPA (International Phonetic Alphabet) transcription for "thorium" is /ˈθɔːɹiəm/. 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 "thorium"?
From Thor + -ium. 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 "thorium", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

tonsils#37,739unloved#37,752Stryker#37,712witcher#37,772

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

Triassic10 variantssylvan10 variantsSkyler10 variantssilliness10 variants

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

Source: FrequencyWords open word-frequency list