tunnel boring machine
"tunnel-boring-machine" is a 19-letter English headword indexed on PlainSpell.
The verdict
“tunnel boring machine” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 21
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A large machine used to excavate tunnels with a circular cross section.
Corpus desk
Index EN-tunnel-boring-machine · tunnel boring machine · English
tunnel boring machine · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 21 letters
- VOW-7 7 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "T" thin
- PHOTO-UNK Peer pending
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.
| Property | Value |
|---|---|
| Headword | tunnel boring machine |
| Language | English |
| Part of speech | Noun |
| Letters | 21 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “tunnel boring machine” in English
Rare enough to double-check
tunnel boring machine is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A large machine used to excavate tunnels with a circular cross section.".
We couldn't generate a plausible misspelling set for tunnel boring machine, since its letter sequence doesn't invite the usual edit-distance slips. Our dataset records no confusable match here, which typically means the spelling is too distinctive to be mistaken for another word.
Wiktionary doesn't record an etymology for this headword, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is tunnel boring machine, spelled T-U-N-N-E-L- -B-O-R-I-N-G- -M-A-C-H-I-N-E.
Definition
- 1A large machine used to excavate tunnels with a circular cross section.
Recorded use
Wiktionary exampleThese source excerpts show how tunnel boring machine appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Images of the first two Tunnel Boring Machines (TBMs) under construction for HS2 were released on May 26. Each TBM is 170 metres long and weighs around 2,000 tonnes. Once in use, they will run non-stop for three and a half years, stopping only for Christmas and Bank Holidays.
Synonyms
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.