tau vs thu, What's the Difference?

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 spellings diverge

Shared letters are muted; the letters that actually set tau and thu apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

tau

3 ch

thu

Spelling & Dictionary Insight

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

Frequency comparison

tau#36,612

thu#48,228

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "tau" and "thu" be used interchangeably?

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

Which is more common, "tau" or "thu"?

"tau" is the more common of the two: it sits at frequency rank #36,612 in our French list, against #48,228 for "thu". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering tau vs thu

The fastest way to pick the right one every time.

Read both glosses above and match the meaning you intend, only context separates this pair.
See each word in full, definition, IPA, etymology and its other confusables. Full “tau” entry
Browse more pairs most likely to be confused. Most confusable