Which to use
“tau” and “thu” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #36,612
- “tau” frequency rank
- #48,228
- “thu” frequency rank
- 84840
- confusion score
Side-by-Side Comparison
| Feature | tau | thu |
|---|---|---|
| Definition | τ, Τ, dix-neuvième lettre et quatorzième consonne de l’alphabet grec. | Forme mutée de tu par spirantisation. |
Where the eye mixes tau and thu
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. tau (CVV) and thu (CCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Visual trap between tau and thu
A purely visual mix-up. tau (\to\) and thu (\θɨː\) 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 a single letter - a in “tau” becomes h in “thu”. Our composite confusion score for this pair is 84840, derived from the frequency rank of both members and their visual similarity.
tau is recorded at frequency rank #36,612, classified as anoun, pronounced \to\. thu is at rank #48,228, tagged as anoun, pronounced \θɨː\.
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 84840, this pair ranks #12,298 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of tau vs thu
Shared letters: tu. Private to "tau": a. Private to "thu": h.
"tau" · 3 letters · shape CVV · "thu" · 3 letters · shape CCV
Frequently Asked Questions
Can "tau" and "thu" be used interchangeably?
In ordinary French text, does "tau" or "thu" show up more?
Useful next steps
Eye-level mix-up between "tau" and "thu" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "tau" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "thu" - compare definitions side by side with the headword page. Word entry
- This pair ranks #12,298 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "tau" and "thu" also get mixed up with nearby pairs, the highest-scored neighbour is "thu vs tif". Nearby pair
Confusion rank #12,298 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.