cast iron
"cast-iron" is a 8-letter English headword indexed on PlainSpell.
The verdict
“cast iron” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 9
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
| Property | Value |
|---|---|
| Headword | cast iron |
| Language | English |
| Part of speech | Noun |
| Letters | 9 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “cast iron” sits in English frequency
Rare enough to double-check
cast iron is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.".
cast iron has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. No close-neighbour confusable shows up for this headword in our dataset, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: Derived from the casting of this form of iron. See wrought iron for comparison. The correct English form is cast iron, spelled C-A-S-T- -I-R-O-N.
Definition
- 1A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
Etymology
Derived from the casting of this form of iron. See wrought iron for comparison.
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). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “cast iron”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-A-S-T- -I-R-O-N - every other letter order is a misspelling in standard orthography.
- 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.