Which to use
“NIH” is a name and “non” is an adverb - they look or sound alike but fill different roles in a sentence.
- #18,376
- “NIH” frequency rank
- #515
- “non” frequency rank
- 18891
- confusion score
Side-by-Side Comparison
| Feature | NIH | non |
|---|---|---|
| Definition | Initialism of National Institutes of Health. | Obsolete form of none. |
Letter map: NIH vs non
Shared letters muted; letters that set NIH and non apart highlighted. Shared run: 1.
Grammar separator: NIH vs non
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: NIH is aname and nonanadverb. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 18891, derived from the frequency rank of both members and their visual similarity.
NIH is recorded at frequency rank #18,376, classified as aname. non is at rank #515, tagged as anadv, pronounced /nɑn/.
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 18891, this pair ranks #441,907 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of NIH vs non
Shared letters: n. Private to "NIH": hi. Private to "non": o.
"NIH" · 3 letters · shape CVC · "non" · 3 letters · shape CVC
Frequently Asked Questions
Is swapping "NIH" for "non" ever safe?
Which is more common, "NIH" or "non"?
Useful next steps
Pair "NIH" vs "non" is on the table, pick a follow-up below.
- Full dictionary entry for "NIH" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "non" - compare definitions side by side with the headword page. Word entry
- This pair ranks #441,907 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "NIH" and "non" also get mixed up with nearby pairs, the highest-scored neighbour is "NIH vs NPL". Nearby pair
Confusion rank #441,907 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.