IRB vs its, What's the Difference?

Which to use

“IRB” is a noun and “its” is a determiner - they look or sound alike but fill different roles in a sentence.

#33,690
“IRB” frequency rank: #75
“its” frequency rank: 33765
confusion score

Side-by-Side Comparison

Feature	IRB	its
Definition	Initialism of institutional review board, a committee that reviews the designs of proposed experiments to confirm whether all the methods proposed are ethical.	Belonging to it.

Letter map: IRB vs its

Shared letters muted; letters that set IRB and its apart highlighted. Shared run: 1.

3 ch

IRB

3 ch

its

Role in the sentence - IRB and its

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: IRB is anoun and itsadeterminer. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 33765, derived from the frequency rank of both members and their visual similarity.

IRB is recorded at frequency rank #33,690, classified as anoun. its is at rank #75, tagged as adet, pronounced /ɪts/.

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 33765, this pair ranks #326,608 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of IRB vs its

Shared letters: i. Private to "IRB": br. Private to "its": st.

"IRB" · 3 letters · shape VCC · "its" · 3 letters · shape VCC

Frequently Asked Questions

Is swapping "IRB" for "its" ever safe?

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

Which is more common, "IRB" or "its"?

"its" is the more common of the two: it sits at frequency rank #75 in our English list, against #33,690 for "IRB". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "IRB" vs "its" is on the table, pick a follow-up below.

Full dictionary entry for "IRB" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "its" - compare definitions side by side with the headword page. Word entry
This pair ranks #326,608 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IRB" and "its" also get mixed up with nearby pairs, the highest-scored neighbour is "IRB vs ith". Nearby pair

Confusion rank #326,608 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.