IH vs ith, What's the Difference?

Which to use

“IH” is a noun and “ith” is an adjective - they look or sound alike but fill different roles in a sentence.

#35,767
“IH” frequency rank: #49,435
“ith” frequency rank: 85202
confusion score

Side-by-Side Comparison

Feature	IH	ith
Definition	Initialism of industrial hygiene.	Occurring at position i in a sequence.

Letter map: IH vs ith

Shared letters muted; letters that set IH and ith apart highlighted. Shared run: 2. IH runs 2 letters (VC) against ith's 3 (VCC) - the length gap alone is often enough to separate them once you know to check it.

2 ch

3 ch

ith

Grammar separator: IH vs ith

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: IH is anoun and ithanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 85202, derived from the frequency rank of both members and their visual similarity.

IH is recorded at frequency rank #35,767, classified as anoun. ith is at rank #49,435, tagged as anadj, pronounced /aɪθ/.

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 85202, this pair ranks #10,769 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of IH vs ith

Shared letters: hi. Private to "IH": -. Private to "ith": t.

"IH" · 2 letters · shape VC · "ith" · 3 letters · shape VCC

Frequently Asked Questions

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

No - they are not even the same part of speech. "IH" is a noun and "ith" an adjective, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "IH" or "ith"?

"IH" is the more common of the two: it sits at frequency rank #35,767 in our English list, against #49,435 for "ith". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

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

Full dictionary entry for "IH" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ith" - compare definitions side by side with the headword page. Word entry
This pair ranks #10,769 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IH" and "ith" also get mixed up with nearby pairs, the highest-scored neighbour is "ISR vs ith". Nearby pair

Confusion rank #10,769 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.