rot vs ru, What's the Difference?

Which to use

“rot” and “ru” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#34,730
“rot” frequency rank: #16,467
“ru” frequency rank: 51197
confusion score

Side-by-Side Comparison

Feature	rot	ru
Definition	Émission par la bouche, et avec bruit, de gaz stomacaux.	Petit ruisseau.

Where the eye mixes rot and ru

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

rot

2 ch

Look-alike desk: rot vs ru

A purely visual mix-up. rot (\ʁo\) and ru (\ʁy\) 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 51197, derived from the frequency rank of both members and their visual similarity.

rot is recorded at frequency rank #34,730, classified as anoun, pronounced \ʁo\. ru is at rank #16,467, tagged as anoun, pronounced \ʁy\.

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 51197, this pair ranks #156,840 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of rot vs ru

Shared letters: r. Private to "rot": ot. Private to "ru": u.

"rot" · 3 letters · shape CVC · "ru" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "rot" for "ru" ever safe?

No. They are said differently (\ʁo\ versus \ʁy\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Frequency check: "rot" vs "ru" - which ranks higher?

"ru" is the more common of the two: it sits at frequency rank #16,467 in our French list, against #34,730 for "rot". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Eye-level mix-up between "rot" and "ru" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "rot" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ru" - compare definitions side by side with the headword page. Word entry
This pair ranks #156,840 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"rot" and "ru" also get mixed up with nearby pairs, the highest-scored neighbour is "rot vs roya". Nearby pair

Confusion rank #156,840 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.