Which to use
“cotter” and “coulter” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #37,401
- “cotter” frequency rank
- #24,127
- “coulter” frequency rank
- 61528
- confusion score
Side-by-Side Comparison
| Feature | cotter | coulter |
|---|---|---|
| Definition | A pin or wedge inserted through a slot to hold machine parts together. | A cutter, consisting of a blade in either knife form or disk form, attached to the ploughbeam of a plough to cut the sward, in front of the ploughshare and mouldboard. |
Where the eye mixes cotter and coulter
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. cotter runs 6 letters (CVCCVC) against coulter's 7 (CVVCCVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses cotter with coulter
A purely visual mix-up. cotter (/kɒtə/) and coulter (/ˈkəʊltə/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 61528, derived from the frequency rank of both members and their visual similarity.
cotter is recorded at frequency rank #37,401, classified as anoun, pronounced /kɒtə/. coulter is at rank #24,127, tagged as anoun, pronounced /ˈkəʊltə/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 61528, this pair ranks #93,738 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of cotter vs coulter
Shared letters: ceort. Private to "cotter": -. Private to "coulter": lu.
"cotter" · 6 letters · shape CVCCVC · "coulter" · 7 letters · shape CVVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "cotter" and "coulter" be used interchangeably?
In ordinary English text, does "cotter" or "coulter" show up more?
Useful next steps
Eye-level mix-up between "cotter" and "coulter" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "cotter" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "coulter" - compare definitions side by side with the headword page. Word entry
- This pair ranks #93,738 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "cotter" and "coulter" also get mixed up with nearby pairs, the highest-scored neighbour is "cotter vs cower". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #93,738 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.