T4 vs tos, What's the Difference?

Which to use

“T4” and “tos” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#24,791
“T4” frequency rank: #48,234
“tos” frequency rank: 73025
confusion score

Side-by-Side Comparison

Feature	T4	tos
Definition	Quatrième trimestre : octobre, novembre et décembre.	Élève de première année à l’École polytechnique.

Where the eye mixes T4 and tos

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

2 ch

3 ch

tos

Why the eye confuses T4 with tos

A purely visual mix-up. T4 (\te.katʁ\) and tos (\tos\) 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 73025, derived from the frequency rank of both members and their visual similarity.

T4 is recorded at frequency rank #24,791, classified as anoun, pronounced \te.katʁ\. tos is at rank #48,234, tagged as anoun, pronounced \tos\.

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 73025, this pair ranks #41,907 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of T4 vs tos

Shared letters: t. Private to "T4": -. Private to "tos": os.

"T4" · 1 letters · shape C · "tos" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "T4" for "tos" ever safe?

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

Frequency check: "T4" vs "tos" - which ranks higher?

"T4" is the more common of the two: it sits at frequency rank #24,791 in our French list, against #48,234 for "tos". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "T4" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "tos" - compare definitions side by side with the headword page. Word entry
This pair ranks #41,907 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"T4" and "tos" also get mixed up with nearby pairs, the highest-scored neighbour is "tif vs tos". Nearby pair

Confusion rank #41,907 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.