Which to use
“sludge” and “sluice” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #21,661
- “sludge” frequency rank
- #45,666
- “sluice” frequency rank
- 67327
- confusion score
Side-by-Side Comparison
| Feature | sludge | sluice |
|---|---|---|
| Definition | Solids separated from suspension in a liquid. | An artificial passage for water, fitted with a valve or gate, for example in a canal lock or a mill stream, for stopping or regulating the flow. |
Where the eye mixes sludge and sluice
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Visual trap between sludge and sluice
A purely visual mix-up. sludge (/slʌd͡ʒ/) and sluice (/sluːs/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 67327, derived from the frequency rank of both members and their visual similarity.
sludge is recorded at frequency rank #21,661, classified as anoun, pronounced /slʌd͡ʒ/. sluice is at rank #45,666, tagged as anoun, pronounced /sluːs/.
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 67327, this pair ranks #63,851 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of sludge vs sluice
Shared letters: elsu. Private to "sludge": dg. Private to "sluice": ci.
"sludge" · 6 letters · shape CCVCCV · "sluice" · 6 letters · shape CCVVCV
Known mistypes of this pair
Frequently Asked Questions
Do "sludge" and "sluice" mean the same thing in a sentence?
In ordinary English text, does "sludge" or "sluice" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "sludge" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sluice" - compare definitions side by side with the headword page. Word entry
- This pair ranks #63,851 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sludge" and "sluice" also get mixed up with nearby pairs, the highest-scored neighbour is "sluice vs splice". 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 #63,851 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.