Which to use
“ISBN” is a noun and “ISIS” is an abbrev - they look or sound alike but fill different roles in a sentence.
- #6,075
- “ISBN” frequency rank
- #7,491
- “ISIS” frequency rank
- 13566
- confusion score
Side-by-Side Comparison
| Feature | ISBN | ISIS |
|---|---|---|
| Definition | 10- oder 13-stellige Nummer zur eindeutigen Kennzeichnung von Büchern, die seit 1973 jedes Buch erhält | Abkürzung für die Terrorgruppe „Islamischer Staat im Irak und Syrien“ bzw. „Islamischer Staat im Irak und in Syrien“ bzw. „Islamischer Staat im Irak und in (Groß-)Syrien“ |
Letter map: ISBN vs ISIS
Shared letters muted; letters that set ISBN and ISIS apart highlighted. Shared run: 2. ISBN (VCCC) and ISIS (VCVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Role in the sentence - ISBN and ISIS
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ISBN is anoun and ISISanabbrev. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 13566, derived from the frequency rank of both members and their visual similarity.
ISBN is recorded at frequency rank #6,075, classified as anoun, pronounced [iːʔɛsbeːˈʔɛn]. ISIS is at rank #7,491, 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 13566, this pair ranks #1,957,168 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ISBN vs ISIS
Shared letters: is. Private to "ISBN": bn. Private to "ISIS": -.
"ISBN" · 4 letters · shape VCCC · "ISIS" · 4 letters · shape VCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "ISBN" for "ISIS" ever safe?
Which is more common, "ISBN" or "ISIS"?
After this comparison
Pair "ISBN" vs "ISIS" is on the table, pick a follow-up below.
- Full dictionary entry for "ISBN" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ISIS" - compare definitions side by side with the headword page. Word entry
- This pair ranks #1,957,168 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "ISBN" and "ISIS" also get mixed up with nearby pairs, the highest-scored neighbour is "IMs vs ISIS". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #1,957,168 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.