Which to use
“tau” and “tax” are a confusable Portuguese pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #32,397
- “tau” frequency rank
- #35,800
- “tax” frequency rank
- 68197
- confusion score
Side-by-Side Comparison
| Feature | tau | tax |
|---|---|---|
| Definition | nome da décima nona letra do alfabeto grego (Τ/τ) | apócope de táxi |
Where the eye mixes tau and tax
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. tau (CVV) and tax (CVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Look-alike desk: tau vs tax
A purely visual mix-up. tau (/taw/) and tax (/taks/) 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 - u in “tau” becomes x in “tax”. Our composite confusion score for this pair is 68197, derived from the frequency rank of both members and their visual similarity.
tau is recorded at frequency rank #32,397, classified as anoun, pronounced /taw/. tax is at rank #35,800, tagged as anoun, pronounced /taks/.
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 68197, this pair ranks #4,363 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.
Orthographic DNA of tau vs tax
Shared letters: at. Private to "tau": u. Private to "tax": x.
"tau" · 3 letters · shape CVV · "tax" · 3 letters · shape CVC
Frequently Asked Questions
Is swapping "tau" for "tax" ever safe?
In ordinary Portuguese text, does "tau" or "tax" show up more?
Useful next steps
Eye-level mix-up between "tau" and "tax" 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 "tax" - compare definitions side by side with the headword page. Word entry
- This pair ranks #4,363 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "tau" and "tax" also get mixed up with nearby pairs, the highest-scored neighbour is "tax vs til". Nearby pair
Confusion rank #4,363 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.