Which to use
“rule” is a verb and “rust” is a noun - they look or sound alike but fill different roles in a sentence.
- #24,780
- “rule” frequency rank
- #46,045
- “rust” frequency rank
- 70825
- confusion score
Side-by-Side Comparison
| Feature | rule | rust |
|---|---|---|
| Definition | ditar regras, fazer regras | ferrugem |
Letter map: rule vs rust
Shared letters muted; letters that set rule and rust apart highlighted. Shared run: 2.
Part-of-speech tell for rule / rust
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: rule is averb and rustanoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 70825, derived from the frequency rank of both members and their visual similarity.
rule is recorded at frequency rank #24,780, classified as averb. rust is at rank #46,045, 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 70825, this pair ranks #3,518 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of rule vs rust
Shared letters: ru. Private to "rule": el. Private to "rust": st.
"rule" · 4 letters · shape CVCV · "rust" · 4 letters · shape CVCC
Known mistypes of this pair
Frequently Asked Questions
Can "rule" and "rust" be used interchangeably?
In ordinary Portuguese text, does "rule" or "rust" show up more?
After this comparison
Done with this confusable. These links stay specific to "rule" and "rust".
- Full dictionary entry for "rule" 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 #3,518 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "rule" and "rust" also get mixed up with nearby pairs, the highest-scored neighbour is "ruma vs rust". 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 #3,518 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.