I'd vs ill, What's the Difference?

Which to use

“I'd” is a contraction and “ill” is an adjective - they look or sound alike but fill different roles in a sentence.

#33,016
“I'd” frequency rank: #44,899
“ill” frequency rank: 77915
confusion score

Side-by-Side Comparison

Feature	I'd	ill
Definition	contração de I would (esse caso é o mais utilizado)	doente

Letter map: I'd vs ill

Shared letters muted; letters that set I'd and ill apart highlighted. Shared run: 1. I'd runs 2 letters (VC) against ill's 3 (VCC) - the length gap alone is often enough to separate them once you know to check it.

3 ch

I'd

3 ch

ill

Role in the sentence - I'd and ill

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: I'd is acontraction and illanadjective. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 77915, derived from the frequency rank of both members and their visual similarity.

I'd is recorded at frequency rank #33,016, classified as acontraction. ill is at rank #44,899, tagged as anadj, pronounced /ɪl/.

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 77915, this pair ranks #1,771 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of I'd vs ill

Shared letters: i. Private to "I'd": d. Private to "ill": l.

"I'd" · 2 letters · shape VC · "ill" · 3 letters · shape VCC

Frequently Asked Questions

Do "I'd" and "ill" mean the same thing in a sentence?

No - they are not even the same part of speech. "I'd" is a contraction and "ill" an adjective, so a sentence built for one is usually ungrammatical with the other.

In ordinary Portuguese text, does "I'd" or "ill" show up more?

"I'd" is the more common of the two: it sits at frequency rank #33,016 in our Portuguese list, against #44,899 for "ill". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "I'd" and "ill".

Full dictionary entry for "I'd" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ill" - compare definitions side by side with the headword page. Word entry
This pair ranks #1,771 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"I'd" and "ill" also get mixed up with nearby pairs, the highest-scored neighbour is "ill vs ino". Nearby pair

Confusion rank #1,771 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.