superfluid
"superfluid" is a 10-letter English headword indexed on PlainSpell.
The verdict
“superfluid” is uncommon English (frequency #95,473 among 54,294 “S” headwords), classed as a noun. The kind of spelling people second-guess.
- #95,473
- frequency rank, English
- 54,294
- “S” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A substance, such as liquid helium, that exhibits superfluidity.
| Property | Value |
|---|---|
| Headword | superfluid |
| Language | English |
| Part of speech | Noun |
| Letters | 10 |
| Frequency rank | #95,473 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “superfluid” sits in English frequency
Rare enough to double-check
superfluid is uncommon English at frequency #95,473 among 54,294 “S” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A substance, such as liquid helium, that exhibits superfluidity.".
We couldn't generate a plausible misspelling set for superfluid, which points to an orthography that plays by predictable English rules. This headword has no recorded confusable partner, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From super- + fluid. The correct English form is superfluid, spelled S-U-P-E-R-F-L-U-I-D.
Definition
- 1A substance, such as liquid helium, that exhibits superfluidity.
Etymology
From super- + fluid.
This word in other languages
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.
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Using “superfluid”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-U-P-E-R-F-L-U-I-D - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.