Which to use
“ninth” is an adjective and “NIST” is a name - they look or sound alike but fill different roles in a sentence.
- #6,387
- “ninth” frequency rank
- #37,115
- “NIST” frequency rank
- 43502
- confusion score
Side-by-Side Comparison
| Feature | ninth | NIST |
|---|---|---|
| Definition | The ordinal form of the number nine. | Acronym of National Institute of Standards and Technology. |
Where the spellings diverge
Shared letters are muted; the letters that actually set ninth and NIST apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ninth is anadjective and NISTaname. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 43502, derived from the frequency rank of both members and their visual similarity.
ninth is recorded at frequency rank #6,387, classified as anadj, pronounced /naɪnθ/. NIST is at rank #37,115, tagged as aname.
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 43502, this pair ranks #239,403 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of ninth vs NIST
Shared letters: int. Private to "ninth": h. Private to "NIST": s.
"ninth" · 5 letters · shape CVCCC · "NIST" · 4 letters · shape CVCC
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "ninth" and "NIST" be used interchangeably?
Which is more common, "ninth" or "NIST"?
Remembering ninth vs NIST
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “ninth”; for a name, it's “NIST”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “ninth” entry
- Browse more pairs most likely to be confused. Most confusable