Which to use
“is” is a verb and “ISBN” is an abbrev - they look or sound alike but fill different roles in a sentence.
- #1,709
- “is” frequency rank
- #11,899
- “ISBN” frequency rank
- 13608
- confusion score
Side-by-Side Comparison
| Feature | is | ISBN |
|---|---|---|
| Definition | contração de agus; e | sigla formada com as iniciais de International Standard Book Number, sequência numérica de dez ou treze dígitos com a finalidade de identificação numérica de um livro segundo seu título, autor, país, ou código de idioma, e a editora, individualizando inclusive edições diferentes de tal forma que cada livro tenha um número próprio e único |
Letter map: is vs ISBN
Shared letters muted; letters that set is and ISBN apart highlighted. Shared run: 2. is runs 2 letters (VC) against ISBN's 4 (VCCC) - the length gap alone is often enough to separate them once you know to check it.
Grammar separator: is vs ISBN
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: is is averb and ISBNanabbrev. On the page they differ by 2 extra letter(s) - “is” sits inside “ISBN”. Our composite confusion score for this pair is 13608, derived from the frequency rank of both members and their visual similarity.
is is recorded at frequency rank #1,709, classified as averb. ISBN is at rank #11,899, 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 13608, this pair ranks #58,680 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of is vs ISBN
Shared letters: is. Private to "is": -. Private to "ISBN": bn.
"is" · 2 letters · shape VC · "ISBN" · 4 letters · shape VCCC
Known mistypes of this pair
- ISBN ← ibsn · isbbn · isbnn · isnb · issbn · sibn
Frequently Asked Questions
Is swapping "is" for "ISBN" ever safe?
Frequency check: "is" vs "ISBN" - which ranks higher?
After this comparison
You've compared "is" and "ISBN". Here's where to go from here.
- Full dictionary entry for "is" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ISBN" - compare definitions side by side with the headword page. Word entry
- This pair ranks #58,680 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "is" and "ISBN" also get mixed up with nearby pairs, the highest-scored neighbour is "íon vs ISBN". 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 #58,680 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.