ill vs ILS, What's the Difference?

Which to use

“ill” is an adverb and “ILS” is an abbrev - they look or sound alike but fill different roles in a sentence.

#25,175
“ill” frequency rank: #44,701
“ILS” frequency rank: 69876
confusion score

Side-by-Side Comparison

Feature	ill	ILS
Definition	schlecht, falsch	internationaler Währungscode für Schekel, die Währung von Israel

Letter map: ill vs ILS

Shared letters muted; letters that set ill and ILS apart highlighted. Shared run: 2. ill and ILS follow the identical consonant-vowel pattern (VCC). Same shape at a glance is often the real trap, independent of shared letters.

3 ch

ill

3 ch

ILS

Grammar separator: ill vs ILS

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ill is anadverb and ILSanabbrev. On the page they differ by a single letter - l in “ill” becomes s in “ILS”. Our composite confusion score for this pair is 69876, derived from the frequency rank of both members and their visual similarity.

ill is recorded at frequency rank #25,175, classified as anadv, pronounced [ɪl]. ILS is at rank #44,701, tagged as anabbrev.

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 69876, this pair ranks #463,284 of 2,006,359 scored German confusable pairs - among the most confusable pairs.

Orthographic DNA of ill vs ILS

Shared letters: il. Private to "ill": -. Private to "ILS": s.

"ill" · 3 letters · shape VCC · "ILS" · 3 letters · shape VCC

Frequently Asked Questions

Do "ill" and "ILS" mean the same thing in a sentence?

No - they are not even the same part of speech. "ill" is an adverb and "ILS" an abbrev, so a sentence built for one is usually ungrammatical with the other.

In ordinary German text, does "ill" or "ILS" show up more?

"ill" is the more common of the two: it sits at frequency rank #25,175 in our German list, against #44,701 for "ILS". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

You've compared "ill" and "ILS". Here's where to go from here.

Full dictionary entry for "ill" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ILS" - compare definitions side by side with the headword page. Word entry
This pair ranks #463,284 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"ill" and "ILS" also get mixed up with nearby pairs, the highest-scored neighbour is "ILS vs IMs". Nearby pair

Confusion rank #463,284 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.