IB vs iz, What's the Difference?

Which to use

“IB” is a noun and “iz” is a verb - they look or sound alike but fill different roles in a sentence.

#16,046
“IB” frequency rank: #32,457
“iz” frequency rank: 48503
confusion score

Side-by-Side Comparison

Feature	IB	iz
Definition	An International Baccalaureate program	third-person singular simple present indicative of be

Letter map: IB vs iz

Shared letters muted; letters that set IB and iz apart highlighted. Shared run: 1.

2 ch

Role in the sentence - IB and iz

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: IB is anoun and izaverb. On the page they differ by a single letter - b in “IB” becomes z in “iz”. Our composite confusion score for this pair is 48503, derived from the frequency rank of both members and their visual similarity.

IB is recorded at frequency rank #16,046, classified as anoun. iz is at rank #32,457, tagged as averb.

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 48503, this pair ranks #192,457 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of IB vs iz

Shared letters: i. Private to "IB": b. Private to "iz": z.

"IB" · 2 letters · shape VC · "iz" · 2 letters · shape VC

Frequently Asked Questions

Can "IB" and "iz" be used interchangeably?

No - they are not even the same part of speech. "IB" is a noun and "iz" a verb, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "IB" or "iz"?

"IB" is the more common of the two: it sits at frequency rank #16,046 in our English list, against #32,457 for "iz". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Done with this confusable. These links stay specific to "IB" and "iz".

Full dictionary entry for "IB" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "iz" - compare definitions side by side with the headword page. Word entry
This pair ranks #192,457 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IB" and "iz" also get mixed up with nearby pairs, the highest-scored neighbour is "ith vs iz". Nearby pair

Confusion rank #192,457 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.