Which to use
“Ruhr” is a name and “rust” is a noun - they look or sound alike but fill different roles in a sentence.
- #47,879
- “Ruhr” frequency rank
- #10,604
- “rust” frequency rank
- 58483
- confusion score
Side-by-Side Comparison
| Feature | Ruhr | rust |
|---|---|---|
| Definition | A river in North Rhine-Westphalia, a branch of the river Rhine and its basin. | The deteriorated state of iron or steel as a result of moisture and oxidation; it consists mostly of iron(III) oxide (ferric oxide) and iron(II) oxide (ferrous oxide). |
Where the eye mixes Ruhr and rust
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: Ruhr vs rust
These two trip readers on the page rather than in the ear: Ruhr is /ɹʊɚ/ while rust is /ɹʌst/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (name vs noun), which is usually the fastest check. Our composite confusion score for this pair is 58483, derived from the frequency rank of both members and their visual similarity.
Ruhr is recorded at frequency rank #47,879, classified as aname, pronounced /ɹʊɚ/. rust is at rank #10,604, tagged as anoun, pronounced /ɹʌst/.
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 58483, this pair ranks #112,249 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of Ruhr vs rust
Shared letters: ru. Private to "Ruhr": h. Private to "rust": st.
"Ruhr" · 4 letters · shape CVCC · "rust" · 4 letters · shape CVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "Ruhr" for "rust" ever safe?
Frequency check: "Ruhr" vs "rust" - which ranks higher?
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 "Ruhr" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "rust" - compare definitions side by side with the headword page. Word entry
- This pair ranks #112,249 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "Ruhr" and "rust" also get mixed up with nearby pairs, the highest-scored neighbour is "Rua vs Ruhr". 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 #112,249 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.