helium
/ˈhiː.li.əm/
"helium" is a 6-letter English headword indexed on PlainSpell.
The verdict
“helium” is a moderately-common English word, ranked #16,725 in English word frequency and used as a noun.
- #16,725
- frequency rank, English
- 6
- letters
- 8
- tracked misspellings
- 4
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | helium |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈhiː.li.əm/ |
| Letters | 6 |
| Frequency rank | #16,725 |
| Misspellings tracked | 8 |
| Confusable pairs | 4 |
| Source | Wiktionary (kaikki.org) |
Where “helium” sits in English frequency
Spelling & Dictionary Insight
The English entry for helium is 6 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈhiː.li.əm/. Corpus data places it at rank #16,725 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 8 likely wrong-spelling variants for helium, with forms such as "ehlium", "heilum", and "helimu". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 4 confusable-pair relationships, "helm", "helix", "heli", and more, where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From New Latin helium, from Ancient Greek ἥλιος (hḗlios, “sun”) (because its presence was first theorised in the Sun's atmosphere) with the suffix + -ium. Probably coined by Norman Lockyer. This suffix is unusual, because it is usually used only for metalli… The correct English form is helium, spelled H-E-L-I-U-M.
Definition
- 1The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
- 2A form or sample of the element.
Etymology
From New Latin helium, from Ancient Greek ἥλιος (hḗlios, “sun”) (because its presence was first theorised in the Sun's atmosphere) with the suffix + -ium. Probably coined by Norman Lockyer. This suffix is unusual, because it is usually used only for metallic elements. It is likely that Lockyer, being an astronomer, was unaware of the usual chemical conventions.
Synonyms
This word in other languages
Common misspellings
Also misspelled as: ehlium,heilum,helimu,heliumm,hellium,heluim,hhelium,hleium
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of helium - 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.
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
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Using “helium”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is H-E-L-I-U-M - every other letter order is a misspelling in standard orthography.
- Say it as /ˈhiː.li.əm/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “helm” - see the side-by-side comparison. helium vs helm
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.