Which to use
“ill” is an adjective and “IUT” is a noun - they look or sound alike but fill different roles in a sentence.
- #15,649
- “ill” frequency rank
- #18,512
- “IUT” frequency rank
- 34161
- confusion score
Side-by-Side Comparison
| Feature | ill | IUT |
|---|---|---|
| Definition | Malade, malsain. | Composante d'université française qui assure une formation continue d’enseignement supérieur, et délivre le diplôme DUT. |
Where the eye mixes ill and IUT
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Look-alike desk: ill vs IUT
These two trip readers on the page rather than in the ear: ill is \ˈɪl\ while IUT is \i.y.te\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 34161, derived from the frequency rank of both members and their visual similarity.
ill is recorded at frequency rank #15,649, classified as anadj, pronounced \ˈɪl\. IUT is at rank #18,512, tagged as anoun, pronounced \i.y.te\.
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 34161, this pair ranks #285,750 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ill vs IUT
Shared letters: i. Private to "ill": l. Private to "IUT": tu.
"ill" · 3 letters · shape VCC · "IUT" · 3 letters · shape VVC
Frequently Asked Questions
Can "ill" and "IUT" be used interchangeably?
Which is more common, "ill" or "IUT"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "ill" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "IUT" - compare definitions side by side with the headword page. Word entry
- This pair ranks #285,750 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ill" and "IUT" also get mixed up with nearby pairs, the highest-scored neighbour is "isi vs IUT". Nearby pair
Confusion rank #285,750 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.