IH vs II, What's the Difference?

Which to use

“IH” and “II” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#35,767
“IH” frequency rank: #1,020
“II” frequency rank: 36787
confusion score

Side-by-Side Comparison

Feature	IH	II
Definition	Initialism of industrial hygiene.	Initialism of illegal immigrant.

Letter map: IH vs II

Shared letters muted; letters that set IH and II apart highlighted. Shared run: 1.

2 ch

Spelling & dictionary notes on IH vs II

IH and II are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by a single letter - h in “IH” becomes i in “II”. Our composite confusion score for this pair is 36787, derived from the frequency rank of both members and their visual similarity.

IH is recorded at frequency rank #35,767, classified as anoun. II is at rank #1,020, tagged as anoun.

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 36787, this pair ranks #300,141 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of IH vs II

Shared letters: i. Private to "IH": h. Private to "II": -.

"IH" · 2 letters · shape VC · "II" · 2 letters · shape VV

Frequently Asked Questions

Is swapping "IH" for "II" ever safe?

No. They differ by a single letter - h in “IH” becomes i in “II”, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

In ordinary English text, does "IH" or "II" show up more?

"II" is the more common of the two: it sits at frequency rank #1,020 in our English list, against #35,767 for "IH". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

You've compared "IH" and "II". Here's where to go from here.

Full dictionary entry for "IH" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "II" - compare definitions side by side with the headword page. Word entry
This pair ranks #300,141 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IH" and "II" also get mixed up with nearby pairs, the highest-scored neighbour is "IH vs ith". Nearby pair

Confusion rank #300,141 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.