mudstone
"mudstone" is a 8-letter English headword indexed on PlainSpell.
The verdict
“mudstone” is uncommon English (frequency #63,816 among 4,057 “M” headwords), classed as a noun. The kind of spelling people second-guess.
- #63,816
- frequency rank, English
- 4,057
- “M” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A fine-grained sedimentary rock whose original constituents were clays or muds.
Corpus desk
Index EN-mudstone · mudstone · English
mudstone · rank #63,816 · 0 variants · 0 confusables
- FREQ-RARE #63,816
- LEN-LONG 8 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,057
- PHOTO-FINISH MRE
Nearest frequency peer: MRE (-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.
Long-tail ranks near “mudstone”
Sparse band: bars invert rank so rarer forms read shorter
- mouthpieces
mouthpieces
36,187 corpus weight
- MRE
MRE
36,186 corpus weight
- mudstone
mudstone
36,185 corpus weight
- multifuncti…
multifunction
36,182 corpus weight
- Muskogee
Muskogee
36,181 corpus weight
- mutagenesis
mutagenesis
36,180 corpus weight
What this shows Long-tail view: where “mudstone” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | mudstone |
| Language | English |
| Part of speech | Noun |
| Letters | 8 |
| Frequency rank | #63,816 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “mudstone” in English
Rare enough to double-check
mudstone is uncommon English at frequency #63,816 among 4,057 “M” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A fine-grained sedimentary rock whose original constituents were clays or muds.".
mudstone has no tracked misspelling variants, suggesting the orthography follows predictable English patterns. It is not paired with a close-neighbour confusable in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From mud + stone. The correct English form is mudstone, spelled M-U-D-S-T-O-N-E.
Definition
- 1A fine-grained sedimentary rock whose original constituents were clays or muds.
Recorded use
Wiktionary examplesThese source excerpts show how mudstone appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The new fossils come from mudstones in central Poland, in beds that have been dated using other, much more common and cosmopolitan, fossils.
Excavation of the twin bore tunnel will produce around 500,000 tonnes of mudstone and soil, which will be processed on site and then reused to build embankments elsewhere along the route.
Etymology
From mud + stone.
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "mudstone", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 8 letters (nearest by frequency rank).